Jump to content
CaddyInfo Cadillac Forum

Head Gasket Question

Recommended Posts

Are you talking about pressurizing the cooling system or the cylinders? Cylinders WILL leak down (blowby) but the air compressor will compensate. What you are looking for (and hoping not to see) is bubbles in the cooling system.

The cooling system on the other hand should NOT leak down.

Link to comment
Share on other sites

When the head gasket was bad on my '94, I pressurized the cylinders and quickly found the offending cylinder.

I did not "see" any bubbles in the expansion tank, however you could definitely "hear" the bubbles.

I used about 120 psi,


2008 STS V8
2016 Colorado Z71
1970 Corvette LT-1 Coupe

Link to comment
Share on other sites


This topic is now archived and is closed to further replies.

  • Recently Browsing   0 members

    • No registered users viewing this page.
  • Create New...