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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
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Wednesday, September 3rd, 2008 AT 11:20 AM

5 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try a 13 psi cap. Might not be letting it to the overflow bottle, thus creating leaks
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Wednesday, September 3rd, 2008 AT 6:48 PM
Tiny
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  • 4 POSTS
Are all radiator caps universal as far as size goes. So, all I need to do is pick-up a 13psi cap. Thanks, Mark
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Thursday, September 4th, 2008 AT 6:06 AM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Yes, the small import ones are obviously too small. Other than that, they are the same
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Thursday, September 4th, 2008 AT 7:33 AM
Tiny
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Thanks Jack, that's what the problem was!
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Saturday, September 6th, 2008 AT 6:00 PM
Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
My pleasure. More isnt always better. Lol
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Sunday, September 7th, 2008 AT 8:35 AM

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