Overheating issues 05 equinox

[man with a plan]

I I have a 2005 Chevy equinox that's overheating took it to a mechanic he ran a block test and a compression test said it passed picked up the vehicle two days later did the same thing couldn't get another appointment till next week took the car today said there's gas fumes coming up through the cooling system I replaced the thermostat water pump radiator coolant temperature sensor and still having issues not sure if it's mechanic just didn't want to work on my car or can somebody please tell me if there's anything I can do to buy me time with this vehicle if it is the head gasket

 

[Uluz2a6]

When the mechanic did the compression test, was the vehicle at full temperature? The head gasket(s) on a warped cylinder head may be able to provide some seal at lower temp. This engine is known for needing cylinder heads machined straight again and new gaskets. Also is the cooling system full of coolant or just water? Makes block test difficult if mostly water, specially if issue occurs only at full temp