Over pressurizing coolant expansion tank when in boost

[Andy13186]

Been having an issue where my coolant expansion tank is apparently getting over pressurized and leaking from fittings after I get into boost. A hose came off a T fitting too. Suspecting possible head gasket? What you guys think, is there any other possible reason?

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[sk47]

Suspecting possible head gasket?

That makes sense. two old school things to do. One is to, when cool, open the radiator cap and look for bubbling when running.
Another is to pull spark plugs and look for odd discoloration.
Neither is foolproof.

Not sure about this but there may be coolant test strips which show combustion byproducts.

Lastly is the engine oil milky at all?

 

[sk47]

Mastercool Combustion Gas Leak Tester Kit NTE 783760 | Buy Online - NAPA Auto Parts (napaonline.com)

Hello; I was curious about how to test. Found the above link. looked for test strips but too many non specific options came up.

 

[bankyf]

I can usually smell the combustion gasses in the coolant when a head gasket is blown. Harbor Freight sells a combustion gas tester for a pretty reasonable price.
https://www.harborfreight.com/combu...814.html?_br_psugg_q=combustion+leak+detector
That's going to be the easiest way for you to confirm, but their really isn't anything else that cause it.

 

[80FoxCoupe]

Possibly lifting a head under boost.

 

[Mike Pfeifer]

Sounds like you got some good advice already, I’d go with that.

 

[SolarFlare]

I was randomly finding coolant(small amounts) around the overflow cap after pulls. Swapped the cap, same thing. Compression tested SAT so just finished putting studs, fresh gaskets, timing components, pac springs and gt350 water pump. Hopefully doesn’t happen again lol

 

[furdfan2018]

Definitely head gasket/s.

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