what causes car to run hot when ac is on
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- 07-19-2006, 10:11 PM. Also contributing to it is your A/C's condensor, the radiator-like (actually, it is essentially a radiator) thing that sits in front of your car's radiator. When you run your A/C the condensor gets hot too and must be cooled off via air flow in addition to the cooling system's radiator.he engine is working to turn the pulley to drive the compressor and the load is not inconsiderable.Also contributing to it is your A/C's condensor, the radiator-like (actually, it is essentially a radiator) thing that sits in front of your car's radiator.
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DIY Auto Service: AC System Diagnosis by Symptom DIY Auto Service: AC System Diagnosis by Symptom. AC System Diagnosis. The typical complaint for an AC problem is the AC blows warm air. This condition could be caused by; the AC system being low on refrigerant, an electrical problem not allowing the compressor to turn on, an internal problem in the system or a problem with the heater/AC controls.
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What can cause a vehicle to run hot, but not overheat? Hotter after sitting briefly is normal. The coolant continues to absorb heat from the hot engine, while not having any airflow for cooling. Shouldn't be too extreme though, should only climb to near what the oil temperature is (under normal conditions 10-30 degrees difference is typical). – Brian Knoblauch Jul 7 '11 at 18:49.
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- Sitting idle (with no air passing over the cooler) can also raise the heat soak causing loss of performance (or detonation), but it will reduce the heat soak as the car is moving with fresh (relatively) cool air passing over the intercooler again. The same thing happens with cooling systems.
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What to Do If Your Car Overheats Although hot weather is the most common cause of overheating, many other factors can cause the same problem. If your vehicle overheats in traffic in normal weather, one of the following may be the culprit: The water and coolant level in the radiator is low.
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Whatâs That Smell Coming From My AC? AC Smells Like: Burning. If you smell burning from your AC unit, you probably have an electrical problem. The burning smell can come from either a blower motor that overheated or a mechanical failure of some sort. This is due to the build up heat of plastic insulation on wires, causing melting and the burning smell in your unit. Also, if plastic, rubber, or other objects get caught in your ductwork, this can cause a burning smell. Even dirty air filters can overheat your AC unit, creating a burning smell. AC Smells Like: Rotten Eggs. If your air conditioning smells like rotten eggs, you could have a potentially serious issue. The smell usually comes from a backed up sewage line that has split near a break in your air duct system. From the sewer, methane gases, the cause of the stench, leak into your AC unit, allowing your air ducts to circulate all around your home.
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- 5. Cancel. The most common cause for an overheating car is low antifreeze, but other causes may be a thermostat sticking or a slipping belt. Discover how sticking brakes can cause a car to overheat with help from an ASE-certified mechanic in this free video on troubleshooting car problems.. Cancel. The most common cause for an overheating car is low antifreeze, but other causes may be a thermostat sticking or a slipping belt. Discover how sticking brakes can cause a car to overheat with help from an ASE-certified mechanic in this free video on troubleshooting car problems.
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- I had the same problem. My radiator cap was not keeping any pressure. When I would stop the engine hot, it would spill one or two cup of coolant throught the overflow tank and I would hear the coolant boiling in the engine.lose. My car has 110,000 mi.and I have replaced the radiator cap and had the system flushed and filled, also replaced thermostat, and overflow resovoir tank--and it still pumps coolant out the overflow and then starts to run hot.
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- 1 A bad radiator cap can which allows the coolant to escape. 2  A bad sensor can give incorrect readings and causes the warning light on the dash to come on.  A blocked radiator can cause problems in the flow of the coolant, which could also cause the sensor to give an incorrect reading and force the light to turn on.
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- Car AC Repair Service & Cost. What to Expect: For an AC system to work, it needs a gas or liquid substance called refrigerant (R-12 in older cars, R-134a in 1995 and newer cars). Over time, refrigerant can leak from the AC system through seals. If the AC does not have enough refrigerant, it will not blow cold air.
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Does Driving With The AC On Actually Use More Fuel? Both organizations recommend that you use your car’s AC when driving at speeds above 45 MPH. With that in mind, it’s probably best to do your driving in the early morning or later at night when possible. This is when the day is (usually) cooler. Driving with the A/C off and windows up is the most fuel efficient way to operate your automobile.
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Air conditioner causing car to run hot Air conditioner causing car to run hot on 1996 Lexus LS400. The air conditioner works fine but when it is turned on the car runs hot. The car doesnt run hot as long as the air conditioner remains off. by jazzyboo in Shreveport, LA on July 31, 2009.ar runs great except when I run the air conditioner it runs hot. when i cut the air conditioner off it stops running hot can you help. Im not sure if I can get back to this page.
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Reasons Why Your Car Is Overheating 2b. Bad Radiator Fan Switch: There is a switch that tells your cooling fan to come on when your coolant reaches a certain temperature. The easiest way to test this switch is to disconnect the wiring harness and then run a jumper wire across the harness contacts. If the fan comes on, you need to replace the switch.
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Fuel Economy in Hot Weather Running your car's air conditioning is the main contributor to reduced fuel economy in hot weather. Its effect depends on a number of factors, such as the outside temperature, humidity, and intensity of the sun. Under very hot conditions, AC use can reduce a conventional vehicle's fuel economy by more than 25%.
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- A car's air conditioner will usually go bad over time; it can also go bad if it is used too often or not often enough. Other causes include: physical damage to the compressor or the fan, overheating, extreme temperatures, particle accumulation in moving parts, and foreign objects inside ventilation ducts.
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- Keep an eye on your vehicle's temperature gauge. When the vehicle is running beyond optimal temperature (anything into the red portion of the gauge), this is the first sign of trouble. 6. Assume there is a leak somewhere in the cooling system if you experience an acrid smell when the engine is at ideal temperature.
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- Engine temperature rising when the engine is idling is normal. The car is sitting still and no air is entering the engine compartment. This will cause the engine temperature t…o rise. The cooling fans then come on and the engine returns to a normal temperature. Unless the cooling fans do not bring the temperature down, you have no problems and this is totally normal.
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- 1 A blocked radiator can cause problems in the flow of the coolant, which could also cause the sensor to give an incorrect reading and force the light to turn on.  Air bubbles can be difficult to get out even if the system has a bleeder valve for getting the air out.
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PT Cruiser AC air conditioning fix how to If you run the car and the ac compressor turns on and off (it sounds like a click noise and then the engine gets a little louder) then it is most likely a coolant problem. either a leak or simply needs to be charged. If the ac compressor does not turn on, try and replace the low pressure sensor.
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- A thermostat is used to block coolant flow to the radiator until it warms to the proper temperature. When the engine thermostat fails to close fully, the engine coolant temperature may fail to rise enough. Low engine temperature causes several problems and may cause the heater to blow cool air.
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What Does the Coolant Temperature Warning Light Mean? A warning light is displayed on the dashboard if the coolant temperature is too hot. What the coolant temperature warning light means. On engine startup, the warning light will illuminate for a second or two to check the bulb and should then go out. If the warning light is illuminated even after startup, it indicates that the car’s computer has detected an issue within the system. The most common reasons for the warning light to displayed are the temperature or fluid level of the coolant. If you are driving when this warning light goes on, pull over safely as soon as possible and shut off the engine to let everything cool down.
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Frequently Asked Air Conditioning and Heating Questions Frequently Asked Air Conditioning and Heating Questions. Sometimes homeowners turn the fan switch to On versus Auto which causes the indoor fan to run continuously. Turn the switch to Auto and the fan should stop running continuously. Yes, there are a couple. The first is that you get constant filtering of the air in your home. The second is that because the air is moving, you have a more even temperature throughout the home. However, continuous fan mode during the cooling season may not be appropriate in humid climates.
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- For an AC system to work, it needs a gas or liquid substance called refrigerant (R-12 Freon in older cars, R-134a in 1995 and newer cars). Over time, refrigerant can leak from the AC system through seals. If the AC does not have enough refrigerant, it will not blow cold air.
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- When the overheating has passed, proceed on the road a little slower, and don't resume normal driving for 10 minutes. If the radiator starts boiling over, pull off the road as soon as possible. Shut off the engine. When the boiling stops, raise the hood, but don't touch the radiator cap. Allow the system to cool.