2010 Grand Marquis pressure release from driver side of engine sound like air tank relief on diesel truck. Slight amount of antifreeze shows up on crossmember. Slight amount of vapor when spewing sound occurs. Engine heat normal.

Asked by Smittystallings Dec 07, 2019 at 07:22 PM about the 2010 Mercury Grand Marquis LS

Question type: Maintenance & Repair

2010 Grand Marquis pressure release from driver side of engine sound like air
tank relief on diesel truck. Slight amount of antifreeze shows up on
crossmember. Slight amount of vapor when spewing sound occurs. Engine
heat normal.

1 Answer
5,305

Trippmeister answered 4 years ago

This sounds bad, either a blown head gasket, or cracked head. Check for water suds on inside of oil cap. You could have the cooling system pressure checked.

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