Pressure
40

Asked by Shawn Apr 04, 2017 at 10:54 PM about the 1999 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

My cooling system has a lot of pressure in
it after sitting all night what could cause
this

4 Answers
40

Shawn answered 7 years ago

I have a reservoir with a pressurized cap. I just got done replacing everything for the cooling system

Mark helpful

F_O_R answered 7 years ago

The only way a cooling system will be under pressure when the engine is cool is a faulty cap. Maybe you have the wrong type cap or a head gasket leak.

1 people found this helpful.
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