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Chevy dealer thinks a blown head gasket. Going to pressure check the engine.

Thanks, I’m down to the ECM. Local Chevy dealer will hook up and diagnose. He mentioned a software issue may be present and need programming. I guess I’ll bite the bullet and let them help out.

And it it a 1.5L

Thanks for getting back to me. No codes and the ac works until the engine gets over 210. Changed the coolant temp sensor and the evap cooling sensor so far.

Coolant fan will run intermittently when engine is first started then stops running at 200 degrees and won’t come back on. I have changed the coolant temperature sensor and the fluid level is good. Doesn’t appear to be relay to test, any thoughts?