Question about 2004 Pontiac Grand Prix

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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 will run even if the car is off and the keys removed. If the fuse isn't removed,the fan will run all the time causing the battery to die. I'm at my wits end and can't afford a diagnostics estimate, let alone some sort of huge expensive replacement. Thanks!

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  • Pontiac Master
  • 9,639 Answers

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.

Posted on Jun 17, 2017

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Posted on Jan 02, 2017

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mrgreenz
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SOURCE: heat /ac fan doesn't work properly

Check the relay for the blower. it may be locked . tap it lightly or jiggle the relay or check with a known good relay.this two circuits may be interconnected. check the light relays as well and fuses.

Posted on Nov 30, 2008

  • 617 Answers

SOURCE: Location of mass air flow sensor, 2000 Grand Prix GTP

3.1 or 3.8 motor, mass air flow is in the fresh air (goes from air cleaner to engine)

Posted on Feb 07, 2010

mlapres
  • 757 Answers

SOURCE: replace thermostat on 2003 grand prix gtp with

The thermostat housing is located in the upper radiator hose. You will see a metal elbow secured by two bolts into what I remember is the upper intake manifold...don't quote me on that but you will see it regardless of whatever I call it. Anyways, GM decided it was a good idea to put stainless steel bolts in there but that makes it easy to strip the threads in the bolt hole so I think it's best when you put your wrench on the bolt to just tap on the handle till you vibrate it loose, then turn it.
When you pull off the housing you'll lose a little coolant and it will create an air pocket which we'll address. It's a 50/50 chance that the thermostat housing gasket will either stick to the housing or the engine...it may be torn, cracked or flaking in either case clean both contact surfaces before you replace the gasket. I recommend an oil impregnated poly material gasket.
Note the position of the thermostat in the hole and place the new one in as such.
I recommend a 180 degree thermostat...stock is 195 but the GTP runs better with the 180.
Put on gasket and reinstall the hose/housing assembly, alternate from one bolt to the other so the housing mates flat and cannot cause a leak.
Next, fill the coolant overflow bottle to the "HOT" mark. If the bottle is dirty and hard to see just put a light on top of the bottle...GM didn't mark it very well so if it's not squeaky clean you can hardly see a damn thing.
*IMPORTANT** if your car still has Dexcool in it, DUMP IT. It will eventually destroy the motor.
If not...continue on. Start the car. Go back to the thermostat housing and place a rag on top of, and twist the peacock valve on top of it to let the air out until it starts to get coolant on the rag. Done.

Posted on Feb 27, 2010

  • 57 Answers

SOURCE: 2004 Pontiac Grand Prix GTP front pass turn signal doesn't work

you would need to buy a blinker relay

Posted on Jul 11, 2010

  • 432 Answers

SOURCE: i have a 2007 pontiac

Good Evening, I have an odd question because I have seen this once before........ Have you checked the low beams themselves, like take out the bulb and look at the filament? The other thing would be to check for power to the plug in when you unplug the bulb get a test light and hook one end to (-) and the light one to the wire if it doesn't light try the other wire. If it lights do the reverse and hook one end to (+) and then the light end to the other wire you didn't test and see if it lights up. If it lights up on both wires your bulb is bad. I have seen headlamp switches go bad and headlamp assemblies as well. However by far I would check for power out at the bulb plug in and check the bulbs. Hope this helps and if you have any more questions please feel free to ask.

Posted on Aug 14, 2010

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