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

6,065

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 people found this helpful.
9,245

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 people found this helpful.

Your Answer:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,710
  • #2
    Tom Demyan
    Reputation
    3,290
  • #3
    munron
    Reputation
    2,820
View All

Related Models For Sale

Used Chevrolet Impala
369 Great Deals out of 25,634 listings starting at $950
Used Dodge Charger
269 Great Deals out of 32,045 listings starting at $1,850
Used Pontiac Bonneville
333 listings starting at $1,900
Used Chevrolet Monte Carlo
3 Great Deals out of 920 listings starting at $3,498
Used Ford Mustang
273 Great Deals out of 37,583 listings starting at $1,350
Used Pontiac G6
37 Great Deals out of 2,814 listings starting at $699
Used Pontiac GTO
384 listings starting at $7,950
Used Pontiac Grand Am
733 listings starting at $1,900
Used Chevrolet Malibu
462 Great Deals out of 51,431 listings starting at $1,975
Used Honda Accord
540 Great Deals out of 103,313 listings starting at $950

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.