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 Post subject: no heat...04 grand prix
PostPosted: Tue Nov 25, 2008 6:34 am 
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i'm not new to the grand prix seen....i have owned 4 of them.....anyway right to the point....my '04 grand prix gt....has no heat....blower works....i just replaced the t stat thinking that was the issue....so i'm stumped now.....need some new ideas...flush the coolant system?? i'm not sure on this one.....


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PostPosted: Tue Nov 25, 2008 8:55 am 
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hmm. heater core?? bad climate control panel?? really no idea but maybe one of those 2

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PostPosted: Tue Nov 25, 2008 1:05 pm 
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hey, thanks for the quick post....really appreciate it....will check those things hopefully today...


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PostPosted: Tue Nov 25, 2008 2:16 pm 
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no problem. hope you find it

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PostPosted: Tue Nov 25, 2008 2:28 pm 
I might be totally hosed here because it's been a few years since I looked at a diagram, but I think there is a motor actuator involved in the heater controls, similar to the one for the Recirc flapper. The Recirc flapper motor was know to fail frequently the first few years these cars were out.

If your cooling system is 100% filled and vented, your water pump is operating, your belt is in place and your engine coolant temps are normal, is has to be an electonic control item somewhere.


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PostPosted: Tue Nov 25, 2008 2:34 pm 
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oh yea thats right. if its quiet enough in the car you can actually hear it. try it when its completely silent in the car and see if you hear the motor.

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PostPosted: Tue Nov 25, 2008 4:17 pm 
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if you did a t stat do a flush, if the gauge says 0 still try getting another thermoustat

my passat dose the same, it dosnt even warm up the t stat is stuck open i think.

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PostPosted: Tue Nov 25, 2008 6:29 pm 
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Referencing what MikeyMP mentioned above.....

The Heat Actuator is the hardest to replace but it can be done, Here is some info on my web page about the Recirc Actuator which is similiar. I can provide you with some Service Manual scans if needed.
http://home.comcast.net/~warren.family/AC.html

Also take a look at: http://www.clubgp.com/newforum/tm.asp?m=2903606
and some more info burried deep in this thread: http://www.clubgp.com/newforum/tm.asp?m=2946595

Also again note that the AC Recirc Actuator is the SAME Part Number for the Heater/blend valve.

Current part number appears to be #15844096 which is $23.16 at http://www.gmpartsdirect.com



Also for those folks that have a Blower Motor that won't turn off some info for you.

http://www.clubgp.com/newforum/tm.asp?m=3317997

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Last edited by Sam2004gp on Sat Nov 29, 2008 7:56 am, edited 2 times in total.

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PostPosted: Tue Nov 25, 2008 6:43 pm 
If it turns out the be the heat actuator and you replace it with a new one, save the old one. It comes apart pretty easily and you can clean it up, regrease it and save it for any future failures.


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