good point to mention. 
How old is your radiator cap?
Thread Starter
Team Owner
Joined: Sep 2003
Posts: 20,179
Likes: 673
From: Freedom is never more than one generation away from extinction.
St. Jude '03 thru '24
How old is your radiator cap?
When was the last time you had it pressure tested?
Just something to think about when chasing problematic temperature issues.
Just something to think about when chasing problematic temperature issues.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Good reminder post..
Even a new gasket should be considered in regular maintenance.
FYI.... the new caps are designed for 'easy on' and 'easy off'.
Many new caps are made by Stant, and packaged under various brand names, including ACDelco.
According to Stant, all new caps are designed for both 'open' and 'closed' systems.
Even a new gasket should be considered in regular maintenance.
FYI.... the new caps are designed for 'easy on' and 'easy off'.
Many new caps are made by Stant, and packaged under various brand names, including ACDelco.
According to Stant, all new caps are designed for both 'open' and 'closed' systems.
Team Owner
Joined: Aug 2005
Posts: 34,988
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From: Riverside County Southern California
Co-winner 2020 C4 of the Year - Modified
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St. Jude Donor '09 thru '20
I replace mine every 5 years. Ghost's is 3 years old, and Betty Boop's is 2 months old.
Race Director
Joined: Apr 2002
Posts: 10,036
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From: Anaheim CA
What I have seen is that radiator caps lose their pressure rating and allow the radiator to boil over when the engine is turned off. You can hear a gurgling sound as the coolant boils into the overflow tank (assuming you have one -- later cars have a remote tank with cap on it).
Heel & Toe
Joined: Apr 2013
Posts: 24
Likes: 2
i test mine every summer. thought i would upgrade to the stant racing one because i thought it is better than the standard one. WRONG. the stant racing looks good and cost three times as much, but fails 1 to 2 psi out of the box and after a few months it was 5 psi off. wrote to stant to find out why it failed so bad and their QA dept didn't catch it or what. never was responded to and questions remain unanswered. I have the best luck with ac delco and also change the thermostat at the same time. a good cap will hold pressure and cause other problems that you may not know of. in my case intake gasket and radiator started to leak. just saying if you don't have any overheating issues, changing an old cap may cause more indepth problems. currently i have the intake off because of this.
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