Question about 2006 Pontiac Grand Prix

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Engine temp overheating when idling computer saying to turn off ac when its not on

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Change the thermostat, or temp sensor. very simple

Posted on May 31, 2010

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I have a 1999 Ford Focus Ghia. Neither the Air con fan nor the engine cooling fan are working. I've checked the fuses, and it's not those.


The engine temp will go up when it is loaded like a hill climb. Also the fan only is run when needed for the engine, it is computer controlled, so unless the engine is overheating at idle you are likely just not aware of how it is operated by the computer, the engine temp will be about 230F before the engine fan is turned on.. As far as the AC blower fan goes you need to pull the fan and see if it works when 12 volts is applied with a jumper. You can run an active system test with a factory scanner and it will test the fan operation.

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What does the temp gauge say ?
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Engine temp overheating when idling or when i turn on the AC?


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May 06, 2011 | 2006 Pontiac Grand Prix

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Coolant fans don't come on when car is in park idleing.."2002 toyota avalon


is it overheating too? what does the coolant temp guage say? first check sensors: Intake air temp or engine coolant temp sensor. (can be done at shop or with a diag computer). also check for a bad thermostat

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My 2007 Impala LS says its overheating shut off A/C the temp gauge goes all the way up then in an instant comes back down to normal


CHECK COOLANT LEVEL TO MAKE SURE NOT LOW.IF ALL LOOKS GOOD.CRANK ENGINE LET IDLE FEW MINUTES TURN ON AC MAX LEVEL TO SEE IF COOLANT FANS COMING ON.IF NO CHECK COOLANT FANS FUSE AND RELAYS.IF COOLANTS FANS COME ON WHILE ENGINE OVERHEATING THERMOSTAT BAD.IF ENGINE OVERHEATING FANS NOT COMING ON YOUR COOLANT TEMPERATURE SENSOR FAULTY.

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Definately have a sensor problem...but that may not be all. You can blame the sensor issue on the idling problem. The overheating in park is likely one of 2 things, provided you have adequate coolant. #1 a sticking thermostat or a bad coolant temp sensor not activating your fan at idle. What you should do is have your diagnostic codes read in order to take care of the sensor issue. Most national parts chains such as Auto Zone or Advance will do this at no charge in hopes of selling you a sensor. Good Luck! I hope you find this to be very helpful.

Feb 18, 2010 | 2001 Saturn S-Series

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2002 Chevrolet Impala overheating while idling


the thermostates on the 3400 engines are late because the fans kick in at the last moment. if you run your ac on you will notice that the gauge stays in front of the half mark or right on the half mark. that is because when you turn on your ac your fans will kick in earlier and stay on the whole time the ac is on. if you run your car with the heat on or nothing on that leaves the late thermostate to kick in verus you turning on your ac and it by passes the thermostates and runs the fans once the engine gets at at lest 120 deg. i use to have a 2002 and i had the same problem. this will keep your engine cooler. also if you don't want your air on just turn on your windshield defrosters (not the back windshield) and that helps keep your engine cool because your defrosters use your air compressor which is really your ac. so it still kicks the fans on earlier.

Dec 11, 2008 | 2002 Chevrolet Impala

1 Answer

Overheating engine: termo guage at the middle during idle


The Temp gauge should read in the middle of the gauge at operating temperature. This is normal. The radiator fan should come on after idling (not driving) for 20 minutes. The fan should also come on when you turn on the AC. Are you experiencing overheat problems?
Please reply if you have overheating issues.

Oct 16, 2008 | 1994 Toyota Corolla

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