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Car overheats when ac is off - Cars & Trucks

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Check that the fan is comeing on,

Posted on Nov 27, 2012

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Why wont my radiator fans work without the ac on


The fans are thermostatically controlled except when the a/c is on. If the engine overheats, the sensor needs replacing. If it doesn't overheat, the fans do not need to come on all the time

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My car overheats when the heat or ac is on My car is a 1992 Lincoln Towncar


Very unusual for it to overheat with the heater on. Running hot with the ac on is often a sign of a faulty radiator fan.

Jan 19, 2014 | Cars & Trucks

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Car overheats when i turn on the ac


check the cooling fan it should be on when the ac is on

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Car overheats and AC stops blowing cold, then temp guage eventually goes back down and AC starts blowing cold, after a while overheats again and AC stops blowing cold again. problem just started after a...


Your AC system is supposed to shut down if the engine is hot, as a safety device-make sure when the ac is running , the radiator fan is blowing-it may not be, caused by either a bad relay, blown fuse or a bad fan motor. Make sure your antifreeze is fully up to level, and if you haven't done it in the past 2 or 3 years, get the cooling system serviced with a new thermostat-cheap insurance, you do NOT want to overheat that aluminum engine, because if you do, it will be toast.

Jun 23, 2011 | 1999 Honda Accord

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99 deville,run normal,overheats when a/c is turned on over 250 degrees ,changed thermostat and coolant sensor,still overheats.


See if the AC fan at the front of the car comes on when the AC is turned on/ It needs the extra air flow.

Jun 18, 2011 | 1999 Cadillac DeVille

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98 jetta car overheat when ac is on


Could be a bad sensor temperature sensor that is telling Fan to shut off . Fans should kick on high the moment the AC is swithced to the on position. I would also check Thermostat

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1 Answer

Ac gives out then van overheats


Both of these need the serpentine belt to run. Maybe its too loose. may need replacement or tensioner

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My car overheat only when i turn on the ac


GET COOLING FANS CHECKED SOUNDS LIKE A DODGEY FAN OR FAN SWITCH

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1 Answer

Overheating


the AC puts an extra load on the cooling system in your car. a short descriptive reason is that the AC condensor is in front of the radiator therefore the heat it emits is dumped into the radiator cooling fins. so when your car overheats when the AC is on and dont overheat when its off its an early warning sign that something in your engine cooling system is going bad. such as thermastat or waterpump. or it could mean your radiator need flushing from the inside and the fins could be clogged with dirt and bugs that get past the grille. try cleaning the cooling system fins first the ac condensor and radiator see if water will sprat through the grill into the fan with your water hose. then if cleaning check all the other items i mentioned good luck james

Jul 06, 2008 | 2000 Cadillac DeVille

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