Check to see whether the power source is working properly if the heater will not turn on. Double-check that the cord isn’t frayed. By plugging in a known-good device and testing the circuit breaker, you can ensure that the electrical socket is in good working order. Make sure the GFCI outlet hasn’t tripped, in case you connected the unit ...Nov 7, 2022 ... I think all models except the basic "3h" have an electric cabin heater. If you have cabin heating when the engine is running & no heat when ...The heater may stop working in VW Jetta due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...Sep 7, 2022 · Here are several reasons the heat isn’t working as it should. Check the Setting. It might seem silly, but not having the thermostat set to heat is often why the heater isn’t turning on. Simply set the desired temperature and turn the unit to “heat” and things should start working correctly. Safety Switches A neglected filter can cause a furnace to blow cold air because it overheats and tries to cool itself by blowing cool air through the ducts and into the home. How to fix: Install a new filter, restart the system, and check the air from the vents. It will run cold at first because there is still cold air in the ducts, but the air should warm ... 1. Make Sure the Thermostat Is Set Properly. Confirm that your thermostat is set on “heat” and the temperature is positioned where you want it. Perhaps someone in your home turned down the thermostat or accidentally flipped the switch. If the thermostat is set properly, turn it up a few degrees to see if that makes a difference. 2. As the demand for efficient and effective heating solutions continues to grow, more and more people are turning to innovative technologies like alpha heaters. Alpha heaters are a t...The heater may stop working in Chevy Silverado 1500 due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system.The heater control valve is an essential component that directs coolant flow through the heater core. If this valve is malfunctioning, it can disrupt the flow of coolant, resulting in a Honda Pilot’s heater not working. A stuck or clogged heater control valve will cause insufficient or no heat from the vents. There should be a reset button near the motor. Press the button. If nothing happens, wait a half hour and try again. Turn off the power to the furnace at the main electrical panel or sub-panel. Look for a fuse on the power switch. If there is one and it has blown, change it following the manufacturer's instruction manual. There are two hoses coming to and from the heater core. They both should feel warm or hot to the touch with the engine on. If one of the hoses is hot, and the other one is cold, that is a pretty good indication that the heater core is clogged. If the neither hose has any heat, you may have air in the cooling system, low fluid, or low pressure.STEP 1: Make sure the thermostat is set to “Heat.”. “This sounds obvious, but it’s true: A lot of people don’t have their thermostat set right,” says Bobby Difulgentiz, director of ...Feb 4, 2019 · In cold rooms a 50 watt can struggle to heat a 10 gallon. Sponge filters don't provide much circulation which may contribute. Most heaters can only raise the temperature a certain amount so you may have to upgrade to a 75 or more. That’s what I had to do in a 10 as my basement is freezing. When the flame acts are squeaking at working, make the rod slippery; 6. The Power Cord Becomes Warm. Heaters are regarded as high-draw applications, and small amounts of the warmth of the cable are customary and acceptable. Damaged outlets are responsible for heat and high resistance. If it is not touchable, you’ll have a problem. …Before you go shopping for a new water heater, you must do your homework. There are numerous factors to consider when selecting the best water heater. Such factors include your per...The heater may stop working in Toyota Matrix due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ... Solution 1: Replace The Fuse. Most of the time, the problem with your heater may start with a bad fuse. Yes, it is a common issue with an appliance with a fuse. If your fuse is terrible, you will understand it. See if the turned-on light is blinking or not. Your fuse is terrible if you see that the light does not light. How to reboot your heater system in less than 1 minute before calling out a technicianSep 7, 2022 · Here are several reasons the heat isn’t working as it should. Check the Setting. It might seem silly, but not having the thermostat set to heat is often why the heater isn’t turning on. Simply set the desired temperature and turn the unit to “heat” and things should start working correctly. Safety Switches Mar 11, 2022 · There is little more unnerving that losing heat in our homes during winter. Having a reliable heating system, and even a backup heating system, can help you rest easier at night so if your furnace isn't working, try this. There are a few things that will cause any furnace to either stop running, or only deliver cold… A neglected filter can cause a furnace to blow cold air because it overheats and tries to cool itself by blowing cool air through the ducts and into the home. How to fix: Install a new filter, restart the system, and check the air from the vents. It will run cold at first because there is still cold air in the ducts, but the air should warm ...The thermocouple could need replacing, you could have a bad gas valve, or the vent could have become blocked. 12. Water Heater Burner goes out. This is likely to be a similar issue to problems with the pilot light. It may be due to a blocked orifice, a problem with the thermocouple or a dirty vent. 13.In today’s fast-paced world, staying warm while on the move is essential. Whether you’re camping, traveling, or simply working in a drafty office, having a reliable source of heat ...Dec 15, 2022 · The fix: Stop by your local home improvement store and pick up a new air filter. 2. Lack of Maintenance. It happens—life gets busy, and the least of your worries is your HVAC system. A lack of maintenance is often the #1 cause of a heater that doesn’t work. Most of the time, the issue is simply a dirty furnace. Space heaters should be placed at least 3 feet away from anything that can catch fire. This safety measure not only applies to the heater’s placement during operation but also during the troubleshooting process. In summary, when trying to determine why an electric space heater isn’t working, always prioritize safety.4. Your Heater Won’t Light or Remain Lit. Newer heating systems rely on electricity instead of gas or oil. Because of this, a lot of the components are digitally controlled. If the light on your heater isn’t lighting up or turns on and off intermittently, this could be a sign of a dirty or broken sensor.The heater may stop working in Audi A4 due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system can ...Having a professional install a garage heater costs approximately between $1,500 and $2,000 including the unit. This price varies depending on the type of heater being installed an...Sep 4, 2023 · Space heaters should be placed at least 3 feet away from anything that can catch fire. This safety measure not only applies to the heater’s placement during operation but also during the troubleshooting process. In summary, when trying to determine why an electric space heater isn’t working, always prioritize safety. Check to see whether the power source is working properly if the heater will not turn on. Double-check that the cord isn’t frayed. By plugging in a known-good device and testing the circuit breaker, you can ensure that the electrical socket is in good working order. Make sure the GFCI outlet hasn’t tripped, in case you connected the unit ...Common Reasons Why There Is No Heat. The filter is dirty. The Thermostat Says Heat On, but no Heat. The gas supply is off. The heater is cut off from the power source. The pilot ignitor is dirty. Does the thermostat say heat on, But No Heat? The thermostat may be on the wrong setting. 3. Clean Filters. One of the most common issues with a heating system not functioning is dirty air filters. If your air filters are extremely dirty, then the airflow can be blocked. Check for clean air filters, vents, and registers. Make sure there are no rugs or furniture blocking vents or registers as well. 4. The temperature is high because it is where the ICE is running most efficient. An EV does not need that temperature, and will max out at about 40C/100F since that is about the optimal high temperature for the battery (during charging). This means it cannot by design get the (unnecessary) high cabin air temperature).Power Supply Problems. One of the most common reasons for an RV electric heater not working is a power supply issue. Before delving into complex troubleshooting, make sure your RV is adequately connected to a power source. Check the circuit breaker or fuse box for any tripped breakers or blown fuses. If found, reset the breaker or replace the fuse.It could be due to a plugged heater core or a water pump that’s not working. In case of the latter, you may also experience an overheating engine or a temperature gauge that’s in the ‘red zone.’. 3. Check Coolant Temperature. The next thing you want to check is the coolant temperature. Start the car while the temperature gauge …If you’re shopping for an air conditioner or heater, one of the first things to consider is the number of BTUs you need to properly cool and heat the space. One way to decide betwe...How to fix your circuit breaker: Turn off the electricity at the circuit breaker and wait for it to cool. Once the circuit breaker is cool, replace it with the size listed by the manufacturer. If your baseboard heater runs for a while then shuts off without tripping the circuit, you may have a defective thermostat.To fix a broken power cord, disassemble your infrared heater to gain access to the power cord’s connection point to the electric circuitry. Likely, you’ll need to unsolder it. Then, get a heavy-duty extension cord for space heaters, cut off the female end of it, strip the wires, and resolder the new cord in place.Unplug your space heater and let it cool down completely. Once you have done that, take it to a different section of the house and plug it back into a different outlet. Preferably, as far removed from the one you normally use, as possible. If your space heater is working again after doing this, mystery solved.The heater may stop working in Buick LaCrosse due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ...Sep 30, 2019 · Photo 1: Disconnect and remove the furnace humidifier that doesn’t work. Remove the screws from the bottom of the old humidifier. Then unscrew the fasteners at the top. Tilt the top out and lift it off the duct or plenum. Furnace humidifiers are pretty simple gadgets. The heater may stop working in VW Jetta due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...Restart your water heater. A current can go awry as a result of a power surge from an electrical storm. Try turning your electric unit off for a couple of minutes and then switch it back on. If ...if the coolant pipes are getting hot but no heat in cabin, it could be the internal heat flaps sticking. press the individual buttons ...Solution: Start by checking the power switch. Replace it if you find any faults there. Then, check the power cord if it is well-working or not. If needed, replace it. Now measure the voltage and wattage of the furnace. Here, the heater needs 1500 Watts (W) or 1.5 kW for operating it.Nov 15, 2023 ... So it's clearly not a case of a bad batch of parts. Either there is a design defect in the PTC heater or a software / control issue that is ...A hot tub that is not heating may be due to a tripped high limit switch on the heater which can be caused by clogged filters or blockage preventing water from flowing through the heater. Additionally, the thermostat may be faulty. And sometimes rodents even chew through wires under the hot tub, preventing the heater from working properly.Main Takeaways. When troubleshooting a pool heater, check the power, temperature settings, filter, pool pump, and plumbing valves. Some common issues with gas pool heaters are with the pilot light, leaks, dark exhaust, and rust. I recommend contacting a professional to help with complex fixes such as electrical, plumbing, or motor issues.Step 2 – Faulty or Old Thermostat: If the thermostat provided with the Aqueon heater has become faulty, it won’t work properly. As a result, you will not get a proper reading from the thermostat. Also, if the thermostat gets old, you should replace it since it loses its accuracy to give the correct reading. Thermostat. 1. Make Sure the Thermostat Is Set Properly. Confirm that your thermostat is set on “heat” and the temperature is positioned where you want it. Perhaps someone in your home turned down the thermostat or accidentally flipped the switch. If the thermostat is set properly, turn it up a few degrees to see if that makes a difference. 2. Dec 6, 2018 ... Heater Not Working · 1) Turn ON the ignition with the engine OFF. · 2) Turn the Temperature dial all the way to the right. · 3) Turn the blower...Low-engine coolant/Antifreeze. This is one of the most common causes and the first to check when the heater isn’t working as it should. Low coolant mostly means there’s a coolant leak somewhere in the system. Regardless of what it means here, enough engine heat will not get into the heater core for heating purposes.To perform a soft reboot: Touch Controls and then tap on Safety. Finally, tap on Power Off to power off your Tesla. Wait 2 minutes and then press the brake pedal to power it back on. If this doesn’t resolve the issue of the heater not working for you, then try the next fixes below.First, check the coolant level in the radiator. If the coolant is low, top it off and see if that solves the problem. If not, check the thermostat. If the thermostat is stuck closed, it won’t allow the coolant to flow through the heater core, preventing it from getting hot. If the thermostat is stuck open, it won’t allow the engine to reach ...Poor water flow can affect the efficiency of the hot tub heater. Inspect the circulation system, including pumps and valves, for any obstructions or blockages. Clean or repair any components that are impeding water flow. 6. Inspect Wiring and Connections. Examine the wiring and connections within the hot tub system.Mar 11, 2022 · Incomplete Combustion. If your RV’s furnace isn’t working properly, carefully check the exhaust vent for soot. The presence of soot indicates incomplete combustion. When the exhaust vents aren’t hot, use a finger to check for soot at the exhaust ports. Soot build-up is a sign of incomplete combustion. The heater may stop working in Toyota Highlander due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ...Reasons a BMW 525i Heater Isn't Working. BMW 525i. The most common reasons a BMW 525i heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 %. 31 % of the time it's the.Dec 27, 2023 · For troubleshooting and service, you can always rely on The Cooling Company at (702) 567-0707. Our dedicated technicians are experts in air conditioning and heating system reset, ensuring your comfort no matter the season. Keep your AC and heater running optimally. Schedule your HVAC maintenance, including checks on the compressor and coils ... To fix a broken power cord, disassemble your infrared heater to gain access to the power cord’s connection point to the electric circuitry. Likely, you’ll need to unsolder it. Then, get a heavy-duty extension cord for space heaters, cut off the female end of it, strip the wires, and resolder the new cord in place.How to Repair a Heater Not Working. Step 1 - A heater cannot operate unless the engine is full of coolant/antifreeze. If coolant level is low check the system for leaks. Step 2 - The engine thermostat control the rate in which the engine heats up. If this unit is stuck open the engine will stay at a low temperature which created little to no ...Do you know how to make a solar water heater using a can? Find out how to make a solar water heater using a can in this article from HowStuffWorks. Advertisement You can harness th...9. Buddy Heater Not Working With 20LB Tank. A 20lb tank can run for upwards of 110 hours with your Buddy Heater. However, if you find that it just isn’t working as it should, you will need to address a couple of possible issues. First, you want to make sure the hose attachment has been connected correctly.Oct 21, 2022 · The heater may stop working in BMW 5 Series due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ... The heater may stop working in Chrysler Sebring due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ...The heater may stop working in GMC Yukon due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling system ...Nov 18, 2020 ... If you need to schedule your heater repair service in San Antonio or just need a heater tune-up, feel free to reach out to Air Authority, A ...Sep 17, 2023 · Nothing. Your infrared heater shows no signs of life. Also, it doesn’t matter if you use the remote or you press the power button directly on the device. …Sep 9, 2021 · 9. Buddy Heater Not Working With 20LB Tank. A 20lb tank can run for upwards of 110 hours with your Buddy Heater. However, if you find that it just isn’t working as it should, you will need to address a couple of possible issues. First, you want to make sure the hose attachment has been connected correctly. Reznor Heater 2 Flashes: Make sure the flame is not going out, and the heater is sensing the flame. Reznor Heater 3 Flashes: Check the pressure switch and alter the button in the opposite direction. Reznor Heater 4 Flashes: Inspect the flame rollout or high limit switch and replace the defective switch.2. Check the Circuit Breaker. If the heater is still not working after power cycling, check the circuit breaker in your electrical panel. Sometimes, a tripped circuit breaker can cause the heater to stop working. Locate the circuit breaker that controls the power supply to the heater and check if it has tripped.The heater may stop working in your vehicle due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system.When it comes to household appliances, the water heater is one that often goes unnoticed until it stops working. It’s an essential component of our daily lives, providing hot water...Low Coolant. While not having enough coolant may make your engine run hotter, it can also cause your TL to not be able to create enough heat. Is there isn’t enough line pressure, due to low coolant, then the heater core will not be able to get any coolant itself. You can verify this by checking the coolant level by taking a peek at the ...The heater may stop working in Chevy Camaro due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ...Check what software version your car is at. Update to the latest version overnight and heat will be back to working in the morning. Maybe due to the contents of specific update or a system reboot caused by an update or due to passage of time the cabin heat will return. 6. Short preconditioning.Jan 12, 2023 · 2. Thermostat Issues (All Water Heaters) If your electricity or gas supply hasn’t been shut off, it’s time to investigate the water heater itself. One of the biggest causes of the hot water in your house not working is the thermostat on the water heater unit itself. Oct 21, 2022 · The heater may stop working in BMW 5 Series due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ... Sep 30, 2019 · Photo 1: Disconnect and remove the furnace humidifier that doesn’t work. Remove the screws from the bottom of the old humidifier. Then unscrew the fasteners at the top. Tilt the top out and lift it off the duct or plenum. Furnace humidifiers are pretty simple gadgets. Main Takeaways. When troubleshooting a pool heater, check the power, temperature settings, filter, pool pump, and plumbing valves. Some common issues with gas pool heaters are with the pilot light, leaks, dark exhaust, and rust. I recommend contacting a professional to help with complex fixes such as electrical, plumbing, or motor issues.Solution: If the draft blower starts – you hear it hum – but the furnace doesn’t ignite, the problem could be caused by a blockage in the vent. This is not super-common, but something to consider if other solutions don’t work. 6. The High Limit Switch is Open.When the flame acts are squeaking at working, make the rod slippery; 6. The Power Cord Becomes Warm. Heaters are regarded as high-draw applications, and small amounts of the warmth of the cable are customary and acceptable. Damaged outlets are responsible for heat and high resistance. If it is not touchable, you’ll have a problem. …Chevrolet Blazer. The most common reasons a Chevrolet Blazer heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 %. 31 % of the time it's the.Jul 25, 2022 ... The pilot light orifice or tube can become clogged or worn out over time and may need replacement if the pilot light will not ignite or if it ...How to fix your circuit breaker: Turn off the electricity at the circuit breaker and wait for it to cool. Once the circuit breaker is cool, replace it with the size listed by the manufacturer. If your baseboard heater runs for a while then shuts off without tripping the circuit, you may have a defective thermostat.4 days ago · How To Fix [With Pictures] You feel a chill run down your spine...this isn’t a horror movie; it’s worse: your heat not working!! When the temperature …Test your blower motor’s connections. Disconnect the blower motor connector. With your key and heater switch both on, test the connector using a test light. Our mechanic shows you how to test the connector’s power and ground at 1:28 in the video above. If your blower motor connector’s power and ground are working, that means …The heater may stop working in Toyota Highlander due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ...
Dodge Ram 2500. The most common reasons a Dodge Ram 2500 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor. 0 %. 31 % of the time it's the.. Digital marketing business
Jan 22, 2020 ... Has there been any leaking from the hoses? Coolant level fine and no hose leaks. Blower works fine in all positions - just no heat. Mechanic's ...Dec 27, 2023 · If your central heating is not working, it’s likely due to one of the following reasons including obstructed filters or coils, malfunctioning components, …Step 3. Check the propane tank regulator. The regulator of the propane tanks that you store outside of the travel trailer can sometimes become faulty. Since the propane tank regulator is the device that addresses how much propane enters the travel trailer system, a faulty regulator can cause a bad pilot light.Start by looking at the circuit breaker assigned to the hot water heater. If the breaker is tripped, the hot water heater isn’t getting the power it needs to function. After turning the switch ...1 hour ago · Punishing hot weather affects not only a person’s health or work productivity but also affects couples’ fertility and birth outcomes, a project by the …First, check the coolant level in the radiator. If the coolant is low, top it off and see if that solves the problem. If not, check the thermostat. If the thermostat is stuck closed, it won’t allow the coolant to flow through the heater core, preventing it from getting hot. If the thermostat is stuck open, it won’t allow the engine to reach ...EdenPURE Service provides a locator feature for certified heater repair agents on its website, as of 2015. Service centers are authorized to work on particular products and models....Check the thermostat settings. Make sure the thermostat is set to the desired temperature and mode (heat or fan). If the thermostat is set correctly but the heater still doesn't turn on, try adjusting the temperature a few degrees higher to see if it kicks in. Inspect the circuit breakers.Feel the thermostat housing if it is warmer than the outside air the block heater is working. Check the cord too as posted above. Make sure it is plugged into the heater. The cord unplugs at the heater side also. If you see any leaking antifreeze around where the block heater cord plugs in to the block heater.If when you reinstall the fan and it's integrated housing the screw holes don't line up perfectly, you do not have the sealing lip on the housing mated up correctly. Work until all the holes line up then replace the screws! Don't expect to be able to start one or more of the screws and finish lining up the others.Power Supply Problems. One of the most common reasons for an RV electric heater not working is a power supply issue. Before delving into complex troubleshooting, make sure your RV is adequately connected to a power source. Check the circuit breaker or fuse box for any tripped breakers or blown fuses. If found, reset the breaker or replace the fuse.Jul 18, 2020 · 2. If your electric heater does not turn on after step one, reset its automatic switch-off feature by turning the power switch to the off position. Disconnect the heater by unplugging it from its power source and letting it sit for ten minutes. Connect it back to its power source and switch the electric heater back on. 4 days ago · How To Fix [With Pictures] You feel a chill run down your spine...this isn’t a horror movie; it’s worse: your heat not working!! When the temperature …Nov 15, 2023 ... So it's clearly not a case of a bad batch of parts. Either there is a design defect in the PTC heater or a software / control issue that is ...The thermocouple could need replacing, you could have a bad gas valve, or the vent could have become blocked. 12. Water Heater Burner goes out. This is likely to be a similar issue to problems with the pilot light. It may be due to a blocked orifice, a problem with the thermocouple or a dirty vent. 13.As you use your Lako heater over time, the device will develop functional issues. One such issue is the device’s inability to turn on even when the red light appears on it. The solution to this problem is a quick reset. To reset your Lasko heater, unplug the device from power and wait for 15 minutes. Then, connect the heater back to power.Sep 23, 2020 · If your heater is not turning on, check the thermostat, filter, gas supply and pilot light first. If these don't fix the problem, call a professional for diagnosis and repair. Learn about the different components of a central heating system and how to prolong its lifespan. The heater may stop working in Chevy Camaro due to low coolant level or air in the cooling system, clogged heater core, bad thermostat, faulty blend door actuator, bad water pump, dirty cabin air filter, bad blower motor, or HVAC control unit malfunction. 1. Low coolant or air in the cooling system. Low coolant level or air in the cooling ....