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I have a 06 Pontiac Grand prix 3.8l. When we bought the car…

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I have a 06 Pontiac...
I have a 06 Pontiac Grand prix 3.8l. When we bought the car it never would get to operating temp and the heater never blew hot air.So I figured it was a stuck open thermostat, I've replaced the thermostat but now the car over heats at idle it won't blow hot air through the vents and at idle if I rev it the temp drops about a quarter and it climbs right back up. I've read that it could be a air pocket?
Submitted: 2 years ago.Category: Pontiac
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Answered in 37 minutes by:
2/29/2016
Pontiac Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Pontiac
Satisfied Customers: 25,777
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is***** is a bleeder screw on the thermostat housing you can crack open while engine runs until all of the air is out, then add more coolant. Let me know how it goes or if you have more questions, thanks.

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Customer reply replied 2 years ago
There is only one on the 3800 series right?
Pontiac Mechanic: Dan, Technician replied 2 years ago

That is correct, let me know if you have more questions. Thanks.

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Customer reply replied 2 years ago
Ok so I went ahead and bought a spill free funnel to burp the air..here's my problem everyone says turn the fan off but the heat all the way on and when you stop seeing bubbles your good. But this has a digital screen if you turn the fan off the temp gauge goes away. Any advice?
Pontiac Mechanic: Dan, Technician replied 2 years ago

Are your radiator fans working?

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Pontiac Mechanic: Dan, Technician replied 2 years ago

Does any air seem to be coming from bleeder? Does keeping fan on high completely stop it from overheating or does it still eventually over heat?

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Customer reply replied 2 years ago
None from the bleeder it seems. The coolant level fluctuates between it being full blast fan and no fan. With the heater off at idle it goes a little above operating temp
Pontiac Mechanic: Dan, Technician replied 2 years ago

If it is only going a little bit above idle and not overheating then I'd consider this normal. The cooling fan is what maintains the the temperature. Let me know if you have more questions, thanks.

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