Possible bad head gasket

Good evening.

Weather is not a factor if you have a bad head gasket. Just do not drive it at all.

Did he do any testing? You can do either a chemical test or a more effective test called a leak down test. That is when the insert shop air into the cylinders and watch for coolant movement in the radiator.

This test needs to be done to verify whether the gasket is good or not. Also, you need to find out why it overheated and have that diagnosed, not guessed at.

Roy

https://www.2carpros.com/articles/engine-overheating-or-running-hot