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Pontiac Grand Prix Climate Control/AC

192 messages,  Last post on Oct 07, 2009 at 12:19 PM

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What is this discussion about? Pontiac Grand Prix, Heating / Cooling, Sedan

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#153 of 192 04 Grand Prix no heat by xtremegixer Dec 04, 2007 (10:28 am)
Replying to: shadow83blk (Oct 23, 2007 11:56 am) So I thought i'd throw this out to everyone...i have an 04 GP GT and the heat decided it doesnt want to work. The blower still works and I was thinking it was the thermostat stuck wide open. Changed it since it was simple and that didnt fix the prob.   Im guessing it's probably the heater core? Has anyone changed this or have a link to a step by step on changing this. To answer some questions ahead of time....there is no coolant leaking into floorboard, there is definitely coolant in resevoir, and heat blows just barely warm...not hot like it should.   Thanks in advance... Blake
#154 of 192 Re: blower [iansme1979] by mresco Dec 04, 2007 (5:36 pm)
Replying to: iansme1979 (Jun 29, 2007 9:29 am) I have a 2004 Grand Prix,,,Looking at the b/m resistor,,It looks like it is pop-riveted to the blower housing. Are they pop rivets? How is the resistor removed,,,,Thanks
#155 of 192 A/C - Heat Not working by coneycone Dec 06, 2007 (6:18 am)
So I have not had heat for the past 2 months. Well, i live in Pittsburgh and well its winter time here. So here is what i have learned in researching this FAN problem.   If you have the issue of your Blower NOT working on speeds 1-4, this is probably your Blower resistor part. (a bit difficult to remove, but doable, price $25)   If you have the issue of your Blower NOT working on any speeds 1-5, this is going to be the Blower motor resistor or the Blower motor (very easy to uninstall and reinstall, price $50-$150, pending manual or automatic climate control).   If you have the issue of multiple things going wrong, HUD, Heated seats, Daytime running lights shutting off, rear defogger - This is most likely your Ignition Wiring ( i think the yellow and orange wires) thing that you read about on here.   I hope this helps, or at least saves you some diagnostic towards your problem.
#157 of 192 2000 Grand Prix Heat Problem by joedude33 Dec 28, 2007 (4:26 pm)
I have no heat in my grand prix. I have taken it to the mechanic twice now, they said the heater coil is fine and the first time they replaced the thermostat because they said it was broken and that should fix the problem. then a week later i took it back because the heat never came on. they then told me that i probably have a blockage in my engine coolant lines so i had my anti-freeze flushed out and then refilled. I still have no heat in my car and i am down $300. right now i am not concerned about the money that i have spent, i just want the heat in my car to work. i live in upstate new york and i am tired of wearing multiple layers in order to stay warm on my morning commute. does anybody have any advice on what i should do next. what else would be causing my heat to not work. all that is coming out is cold air so i dont think it could be the blower. i am a handy guy and i want to take a look at it myself tomorrow. any pointers on how i should approach this would be greatly appreciated... thank you..   Joe Replies to this message: brybry (Dec 29, 2007 5:54 am)
#158 of 192 Re: 2000 Grand Prix Heat Problem [joedude33] by brybry Dec 29, 2007 (5:54 am)
Replying to: joedude33 (Dec 28, 2007 4:26 pm) Hi Joe, I had the same problem with no heat on my 2000 grand prix. I had a low temp reading on my gauge on the dash. I replaced the thermostat and coolant sensor but still no heat and still a low temperature reading on the guage. Turns out the most expensive 'no fail' thermostat was faulty. Went back and bought the cheapest one and is working fine now with lots of heat. The temp guage was probably fine too. Hope this helps.
#159 of 192 inaccurate temp reading for outside air??? by sailers2 Jan 10, 2008 (12:42 pm)
I have a 2000 Grand Prix, and it goes crazy once in a while... I can be driving in 90 degree weather, and everything is working fine, and all of a sudden it thinks that the temp. has dropped to 34 or lower outside, and start putting out heat.... sometimes it takes an hour or so to come back up so the air will start working again... How do You fix this? Replies to this message: brybry (Jan 10, 2008 2:29 pm) sailers2 (Jan 11, 2008 3:27 am)
#160 of 192 2000 Grand Prix engine temp by waynneo1 Jan 10, 2008 (2:01 pm)
I bought this Grand PRix in June, and now that it is colder, the engine temp only rises as high as 175 degrees. I replaced the thermostat, and I noticed the electric fans kick in right away so I will need to replace the thermostat controlling them as well. I have disconnected the fans to try and get the engine temp to come up but to no avail. Even idling in town traffic it doesn't go over 190 with the fans off. I live in WI and we have had some below zero weather already and on those days the temp gauge doesn't come off 160 which gives me very little heat. Am I overlooking something else that could be allowing the water to flow around the theromostat? I've never heard of such a thing, but anything is possible. Any help??
#161 of 192 Re: inaccurate temp reading for outside air??? [sailers2] by brybry Jan 10, 2008 (2:29 pm)
Replying to: sailers2 (Jan 10, 2008 12:42 pm) My 91 olds ninety eight had the same problem. I replaced the exterior thermometer sensor. It was under the hood near the left headlight on this model if I recall. Once replaced all was fine. Replies to this message: sailers2 (Jan 11, 2008 3:27 am)
#162 of 192 Re: inaccurate temp reading for outside air??? [brybry] by sailers2 Jan 11, 2008 (3:27 am)
Replying to: brybry (Jan 10, 2008 2:29 pm) Thank You, now all I have to do is find where it is on a 2000 Grand Prix??? Anybody know?

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