Water shooting out of radiator hose when I pull radiator cap off.

Asked by May 03, 2017 at 06:12 PM about the 2005 Pontiac Grand Prix Base

Question type: Maintenance & Repair

I was sitting in traffic and noticed my car started to
overheat. So I pulled into a 7/11 and popped my
hood. Nothing smelled bad or burned. So I went to
pull my radiator cap off and POW. a jet of water
came shooting out of it. Does this mean I have a
cracked head or blown head gasket? Thanks
everyone

3 Answers

87,415

No, the cooling system builds up pressure when the engine gets to operating temperature. The cooling system was just under pressure when you removed the radiator cap, pushing the expanded coolant out. Never a good idea to remove the radiator cap when the engine is hot. When you have too remove a radiator cap you should have some leather gloves on or a towel over the cap and remove it slowly. When an engine is starting to over heat you do want to get the cap off with the engine running. Once the cap is off then fill the radiator up with the engine running to cool it down.

1 people found this helpful.

Ah that makes sense. Thank you very much!

120,555

Not only is the coolant under pressure but the water may be super heated. If you remove the cap, the super heated water instantly becomes steam which can peal your skin off! Super dangerous!

Your Answer:

Grand Prix

Looking for a Used Grand Prix in your area?

CarGurus has 1,683 nationwide Grand Prix listings starting at $1,350.

ZIP:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,780
  • #2
    munron
    Reputation
    2,950
  • #3
    Dorian Hendricks
    Reputation
    2,390
View All

Related Models For Sale

Used Chevrolet Impala
534 Great Deals out of 25,465 listings starting at $995
Used Dodge Charger
416 Great Deals out of 31,707 listings starting at $1,900
Used Pontiac Bonneville
4 Great Deals out of 311 listings starting at $2,995
Used Chevrolet Monte Carlo
5 Great Deals out of 984 listings starting at $1,995
Used Pontiac GTO
5 Great Deals out of 399 listings starting at $5,450
Used Ford Mustang
352 Great Deals out of 39,217 listings starting at $1,995
Used Pontiac G6
53 Great Deals out of 2,616 listings starting at $1,400
Used Chevrolet Malibu
600 Great Deals out of 53,243 listings starting at $1,500
Used Pontiac Grand Am
735 listings starting at $2,200
Used Chrysler 300
413 Great Deals out of 19,871 listings starting at $1,990
Used Honda Accord
702 Great Deals out of 95,740 listings starting at $1,225

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.