NO heat and Overheats when idling or going under 40 miles an hour

Asked by Sep 24, 2015 at 11:49 AM about the 2006 Pontiac Grand Prix

Question type: Maintenance & Repair

I have replaced the Water Pump, New Radiatior, New SuperCharger, New Coolant system all together, around this time of year after using the AC all summer, can't get any hot air, and then it starts to overheat if not going at least 40 miles an hour or idling.  It will boil back into the overflow tank.  I am at Whits end on what to do and don't want to replace everything again.

6 Answers

7,645

check the thermostat

Thermostat was replaced along with the radiator cap, radiator, water pump, supercharger, anything with coolant going through it.

7,645

is the Freon topped off

Don't know, the AC works fine, just no heat, will that prevent the heat?

3,085

Make sure all the air is bled out of the cooling system using the bleed valve on top of the thermostat housing.

3,865

And, most obvious of all, but easily overlooked, make sure the cooling system is actually full. It's either not full or there's air trapped in the system. Really no other reason for a new cooling system not to work.

Your Answer

Add photo

Related Questions

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 2,857 nationwide Grand Prix listings starting at $1,500.

ZIP:

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,160
#2 Tom Demyan
Tom Demyan
Reputation 2,830
#3 munron
munron
Reputation 2,180
View All

Related Models For Sale

Used Chevrolet Impala
587 Great Deals out of 31,465 listings starting at $799
Used Dodge Charger
390 Great Deals out of 28,078 listings starting at $1,988
Used Pontiac Bonneville
3 Great Deals out of 542 listings starting at $1,799
Used Pontiac G6
83 Great Deals out of 4,104 listings starting at $699
Used Pontiac Grand Am
1,226 listings starting at $1,999
Used Chevrolet Monte Carlo
18 Great Deals out of 1,384 listings starting at $1,995
Used Pontiac GTO
7 Great Deals out of 454 listings starting at $6,000
Used Ford Mustang
454 Great Deals out of 45,520 listings starting at $1,999
Used Chevrolet Malibu
915 Great Deals out of 79,357 listings starting at $1,500
Used Chrysler 300
400 Great Deals out of 19,918 listings starting at $1,000
Used Honda Accord
821 Great Deals out of 85,701 listings starting at $988

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
19 Great Deals out of 424 listings starting at $1,500
2007 Pontiac Grand Prix For Sale
4 Great Deals out of 395 listings starting at $2,500
2006 Pontiac Grand Prix For Sale
453 listings starting at $2,675
2005 Pontiac Grand Prix For Sale
4 Great Deals out of 347 listings starting at $1,895

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.