1999 Chevy Suburban coolant leak

Tiny
RED-TOP
  • MEMBER
  • 1999 CHEVROLET SUBURBAN
  • V8
  • 4WD
  • AUTOMATIC
  • 122,000 MILES
I replaced radiator with new, it started leaking under cap. Replaced cap 3 times, same problem. Returned radiator and installed a new one again. Still leaks under cap. Usually only does this when engine is cooled overnite. Once engine is warm, leaks no more. I have a 16psi cap on it. I took a seal from another cap and put on new cap, thus making rubber seal 2 times the thickness, no longer leaks under cap, now it leaks at hose fitting from radiator to water pump on the radiator side. Not sure what to do next. Is it the plastic expanding and contracting causing this problem or do I try to switch to a lower psi cap, like a 11 or 12 psi. Please help, am going nuts over this. By the way, I am running dex-cool. Thanks for any help, Mark
Do you
have the same problem?
Yes
No
Wednesday, September 3rd, 2008 AT 11:20 AM

5 Replies

Tiny
JACK42
  • MEMBER
Try a 13 psi cap. Might not be letting it to the overflow bottle, thus creating leaks
Was this
answer
helpful?
Yes
No
Wednesday, September 3rd, 2008 AT 6:48 PM
Tiny
RED-TOP
  • MEMBER
Are all radiator caps universal as far as size goes. So, all I need to do is pick-up a 13psi cap. Thanks, Mark
Was this
answer
helpful?
Yes
No
Thursday, September 4th, 2008 AT 6:06 AM
Tiny
JACK42
  • MEMBER
Yes, the small import ones are obviously too small. Other than that, they are the same
Was this
answer
helpful?
Yes
No
Thursday, September 4th, 2008 AT 7:33 AM
Tiny
RED-TOP
  • MEMBER
Thanks Jack, that's what the problem was!
Was this
answer
helpful?
Yes
No
Saturday, September 6th, 2008 AT 6:00 PM
Tiny
JACK42
  • MEMBER
My pleasure. More isnt always better. Lol
Was this
answer
helpful?
Yes
No
Sunday, September 7th, 2008 AT 8:35 AM

Please login or register to post a reply.

Recommended Guides