how come the radiator with pressure rise on a cold start

Gene Wysocki

Asked by Dec 04, 2015 at 07:30 PM about the 2002 Nissan Sentra XE

Question type: Maintenance & Repair

its a 2002 Nissan Sentra 1.8 had the
head surface pressure tested for  
cracks. not sure what to look for.?

2 Answers


Any temperature increase in the coolant will generate pressure which is normal. What exactly is the issue?

Gene Wysocki

Have done quite a few head gaskets in my lifetime and just kind of puzzles me when it's got almost instant pressure to the radiator. Usually you can let a car run and warm up with the radiator cap off but does bubbles back up and out almost instantly.

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