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Fan keeps running

The heat/ac fan blows on high when engine is shut off

Posted by Anonymous on

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 61 Answers

SOURCE: Heater/AC fan motor keeps running after car is shut off

that's normal when hot, but should't run down the battery. if severly overheats ffnd/fix that problem. the other will probably dissapear . if not excessively hot then the fan heat sensor is faulty....

Posted on Jul 22, 2009

matney68
  • 426 Answers

SOURCE: The Heater/AC fan runs all the time on a high

The blower resistor will keep it from working on anything but high

Posted on Oct 03, 2009

  • 1757 Answers

SOURCE: 2001 caravan fan only blows on high ac/heat both

It is the blower motor resistor located behind the dash glove box. Take the glove box out to access and change. It is mounted on/into the fire wall.
Very easy to access, remove and install a new resistor.

Posted on Dec 09, 2009

  • 462 Answers

SOURCE: cooling fan relay location on a 2005 gmc sierra

Check the fan clutch operation. And also check for leaks.

Posted on Mar 05, 2010

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1 Answer

Ac heat wont bturn on


1: engine hot. 180F or more?
2: fan blows on high?
3: got heat at any vent?
AC dont make heat, only the heater coil core, does that.
it only takes 2 things.
engine coolant hot.
and air flow across said core,
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Mar 17, 2014 | Jeep Cars & Trucks

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How can I tell if the engine cooling fan is functioning properly?


The cooling fan is made to come on when the engine reaches a certain temperature. To give a simple and general test - turn the AC on high - it your AC and fan are both working correctly the fan should come on almost immediately. If not within very few minutes like 5 or 8.
Also at operating temperature the fan will run as well. In the early morning before you start the car open the hood - fill the radiator while the engine is still cold. start the engine and wait about 10 minutes or so. The fan should come on before the engine over heats. This may take up to 20 minutes and the fan is designed to run after the car is shut off IF - the temperature is hot enough.

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Location of ac high pressure cutout switch on a 97 Plymouth voyager. Could it be a different problem? Had to replaced the PCM and a couple sensors because of a short in the wiring cluster. Now the ac...


HIGH PRESSURE CUTOFF SWITCH LOCATED ON AC COMPRESSOR DISCHARGE LINE LEADING TO THE CONDENSOR.THE HIGH PRESSURE CUTOFF SWITCH WILL CUT OFF THE AC COMPRESSOR IF SYSTEM PRESSURE RISES TO HIGH CAUSED BY RESTRICTION IN THE REFRIGERANT CIRCUIT OR OVERHEATED CONDENSOR.MAKE SURE COOLING FAN IS RUNNING WHEN THE AC SWITCH IS ON.THE COOLING FAN KEEP CONDENSOR COOL, IF COOLING FAN DONT RUN.YOUR AC WILL STOP BLOWING COLD AIR.HAVE THE REFRIGERANT SYSTEM CHECK OUT.MAKE SURE YOUR LOW SIDE PRESSURE IS 10 - 37 PSI. THE HIGH SIDE PRESSURE SHOULD BE 112 - 210 PSI. CHECK THE AC COMPRESSOR CLUTCH FUSE AND RELAY.

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the coolings fans are designed to run for a little while to dispense heat they dont do it all the time turn usually during higher hot days w/ac on or higher hot days goes off automatically

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1 Answer

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that seems to be the problem. If the fan does not turn on when the a/c is turned on it could be a fuse, relay, control box, or just a bad fan. Try connecting the fan directly to see if it works. Does this car have 2 fans? normally all the small cars have 2 fans one for the engine cooling and one to assist the first when the a/c is turned on. Without the fan pulling air through the a/c condensor the had pressure goes up high enough to shut off the a/c compressor. It also causes some cars to run warmer than usual when stopped. Check the a/c condensor for blockage also which doesn't have anything to do with your fan not working.

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Can't shut off the heat


You didn't say which switch you were referring to. So, since you say the "heat" keeps blowing out, I asume that you do not mean the fan control only (which would simply indicate a faulty switch) but the "heater/AC temperature control". Check the vacuum lines (to heater and AC vent controls under hood first then under dash) for holes/cracks/breaks or if one may have come loose.

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It keeps burning out blower resistors because of the blower motor drawing to much amperage so you will need to replace the resistor and blower motor

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most likely a thermostat because the pressure on the a\c will be high if engine is over heating or the fans are not kicking on (check fan relay)

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