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1996 Cadillac losing coolant! Passing Combustion Test! HELP!

Tiny
JACKS37
  • MEMBER
  • 1996 CADILLAC DEVILLE
  • V8
  • FWD
  • AUTOMATIC
1996 Cadillac Sedan Deville losing Anitfreeze. Upper Radiator hose replaced. Thermostat replaced. Combustion test passed. Engine overheating due to loss of antifreeze in 2 days. Now there are 2 more hoses with leaks due to too much pressure from new hose. Hoses with leaks are original hoses. Without taking off head gaskets what could problem be? Obvious problem would be head gaskets but the combustion test was negative.
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Tuesday, March 29th, 2011 AT 10:50 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
The pressure can't get too high in the system because there is a pressure relief valve built into the radiator cap. Sounds like you just need new hoses.

You might want to find an auto parts store that borrows or rents tools and have them use their radiator pressure tester to test your cap. It should open at no more than 16 psi. 14 - 15 is more common. It will be stamped on the cap.
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Sunday, August 18th, 2019 AT 10:06 AM

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