Alright, so my civic with 243k miles (the stem of my issues) is having overheating problems.

FIRST: it had a leak in the head gasket, which we solved with blue devil. This was probably around 4 months ago.

THEN: the water pump went bad, we replaced that

THEN AGAIN: A hose had a hole, replaced that

EARLIER THIS WEEK: Thermostat went out, replaced that

Now its over heating again. I can't see any obvious reasons it would be doing this. Any tips or explanations?

 

A bad head gasket cannot be fixed by a product in a can.

 

Not permanently obviously, but it hasn't shown any signs (except for the overheating) of the product not working.

 

Overheating is a clear and expected sign that the canned product doesn't work.

 

Well thank you. I'll look more into that.
Although I am surprised that solvent worked for as long as it did

 

Me too