car overheating

Asked by Oct 06, 2016 at 03:00 PM about the 2006 Pontiac Grand Prix Base

Question type: General

2006 poniac gran prix i have change the bottom
hose, thermostat, heating sensor, radiator, water
pump and it still over heat what can it be and can
take the radiator cap off right after shoudnt the
water be boiling

2 Answers

5,285

First, do not take the radiator cap off when the car has been run or is even hot to the touch unless you want to risk getting scalding coolant on you. Very dangerous. Water boils at 212F and your car should typically run at 180-190F. The mixture of coolant and water you put in the cooling system will increase the boiling point of it to about 220-230F and the radiator cap will release at about 15 LBS pressure to expel hot coolant into the overflow tank. It will be recovered later when your engine cools down. So, no, the coolant should NOT be boiling when the cap is removed. Since you have changed almost everything in the system except the upper radiator hose, I would suspect that you have some trapped air in the system that is blocking the flow. Try removing the radiator cap with the engine cold and running the engine to purge any trapped air. The radiator may "burp" coolant out of the throat during this process but that is just the trapped air working its way out. When the system seems to be flowing freely, shut down the car, let it cool and add coolant/water mix to the rim of the cap. Install the cap and fill the recovery reservoir to the "Full Cold" line and you should be good to go. Final note, if you were not filling the system with a 50/50 mix of coolant and water, drain it before doing anything else and refill with the right mixture. Then proceed with this process. Good luck.

1 of 1 people found this helpful.
7,495

There's a plug on the thermostat housing. When engine is cold, fill radiator with coolant, close it back up, loosen the plug or remove it completelly, run engine for a while til it reaches normal temperature. You'll see some coolant bubble out of the plug hole, install plug back in place and shut engine off, should remove air out of the system. If u still have the same issue, check the cooling fans to make sure they're working

1 of 1 people found this helpful.

Your Answer

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,420
  • #2
    Tom Demyan
    Reputation
    3,040
  • #3
    munron
    Reputation
    2,470
View All

Related Models For Sale

Used Chevrolet Impala
536 Great Deals out of 35,327 listings starting at $900
Used Dodge Charger
429 Great Deals out of 28,427 listings starting at $2,490
Used Pontiac Bonneville
503 listings starting at $3,699
Used Pontiac G6
61 Great Deals out of 3,893 listings starting at $1,600
Used Chevrolet Monte Carlo
4 Great Deals out of 1,280 listings starting at $1,488
Used Ford Mustang
612 Great Deals out of 36,332 listings starting at $899
Used Pontiac Grand Am
1,082 listings starting at $994
Used Pontiac GTO
8 Great Deals out of 491 listings starting at $5,995
Used Chevrolet Malibu
983 Great Deals out of 65,991 listings starting at $1,000
Used Chrysler 300
313 Great Deals out of 18,078 listings starting at $990
Used Nissan Maxima
265 Great Deals out of 22,963 listings starting at $1,499

Used Cars For Sale

2008 Pontiac Grand Prix Base For Sale
5 Great Deals out of 362 listings starting at $1,995

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.