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Gm Tech (Cam)
Gm Tech (Cam), GMC Mechanic
Category: GMC
Satisfied Customers: 1693
Experience:  GM Grand Master Technician 2007. 14 year experience.
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I've lost about three quarters of a gallon of coolant,but

Customer Question

I've lost about three quarters of a gallon of coolant,but there's no leaks visable,my guess, is that i may have the beginnings of a blown head gasket,would it be safe to use a block seal product in the radiator of my GMC 5.7 LITER moter in holes that it prevents head gasket failure?
Submitted: 1 year ago.
Category: GMC
Expert:  Dan replied 1 year ago.

Hello, my name is***** agree you either have a leaking head gasket or intake gasket, most likely head gasket. Have you checked to see if coolant is going into oil or transmission fluid? How long has it taken to go through 3 quarters of a gallon? Thanks.