Question about 2005 Pontiac Grand Prix

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2005 grand prix, ac fan runs on high all the time

Even with key turned off

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  • Matthew Boulden May 11, 2010

    On the newer cars the fans can start even if the car is turned off if the sensor detects high heat. If it runs for longer than 15 minutes then you should replace the fan sensor. I hope this helps you, if not please let me know.



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Problem is the inside blower fan, not the raditor fan. T/S to a bad relay on the blower control modual which had to be purchased from the dealer. $274 later it is fixed.

Posted on Jun 23, 2009


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1 Answer

2002 grand prix overheats at idle

Sounds like the fans (which are designed to simulate the wind when u are not moving) are not cutting on. While car is running in park and with the AC on, look under the hood to see if the fan is running? If you have 2 fans, one will run when the AC is on, the other when the car reaches a certain temperature. Post your findings for additional instructions.

Apr 25, 2012 | 2002 Pontiac Grand Prix

1 Answer

When i start my 2005 grand prix i can hear water and i know my ac is not draining but the drain plug is clean on the firewall, as well my engine time runs a little high, cleaned rad and got it flushed and...

Sounds like you have air in the system. Look for an air bleeder near the thermostat on the black steel coolant hose. It will take some experimenting and patience to get the air out but it will happen.

Sep 01, 2011 | 2005 Pontiac Grand Prix

1 Answer

Alrighty my fans arent working when my car grand prix gt is on... the fans only work when i turn the ac or defrost on... we just changed the censors, temp gage, thermostat, pump,fuses, .... and still not...

Turn the key on and unplug the coolant temp sensor to see if the fans will turn car does not need to be running. There should a few relays hi speed fan, lowspeed fan. It is also possible that the fan motors are bad as well. The different speeds are opertating at different voltages and when high speed kicks in enough voltage is supplied to power up the fan however the lowspeed may be requiring to much voltage to operate with in the fans parameter. Attached is your fan circuit wiring diagram a3de536.gifIf you remove the relays one at a time a run a jumper wire between terminals 87 and terminal 30 on the relay you should get the fans to come on. This should work with both relays but make sure to only try what at a time. The terminal numbers will be located on the relays. Pay close attention to the lowspeed relay because when you jump the high and it works but jumping the low does not it may be the actual fans.

Oct 09, 2010 | 1998 Pontiac Grand Prix

1 Answer

I have a 2004 Pontiac Grand Prix GTP. The AC/Heat will only work if the fuse put in (under the hood), then it runs only on HIGH. The control knob can be turned off completely and it still runs oh high. It...

The fan relay is stuck. It is a relatively inexpensive part. Your owners manual will tell you which relay it is and where it is located, most likely under the hood. Once you locate it, pull up on it to remove it and then take it to an auto parts store to get a replacement.

Jun 17, 2017 | 2004 Pontiac Grand Prix

1 Answer


Yes the problem is the blower motor resistor.This will make the fan run even if the key is off at times.Make sure and check the connector when replacing the resistor,sometimes they get hot and will melt the ends.Hope this helps.Good luck.

Apr 21, 2010 | 2005 Pontiac Grand Prix

2 Answers

P0481 on grand prix 2002. cooling fans work with a/c on and relays seem ok. vehicle temp gauge opertaes ok and does not seem to get hot.

sounds normal, the fans were made to run continuous w/ ac running, but on sensor when ac is off. if car isn't overheating, the fans are probably running from time to time ,but your just not catching them running

Sep 04, 2009 | 2002 Pontiac Grand Prix

1 Answer

Fan on high setting all the time, and won't quit

You need to replace the blower resistor/relay.

Mar 02, 2009 | 2000 Pontiac Grand Prix

1 Answer

Air conditioner turns on when car starts.

If only the AC indicator light is on but you are still getting warm air from the vents, this is not an issue.  Most newer cars run the AC compressor nearly all the time to prevent moisture accumulation inside the car.  Without the compressor running, your windows may steam up and hinder your visibility.

Feb 22, 2009 | 2005 Pontiac Grand Prix

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