Quote:
Originally Posted by n4mwd
I'm not sure what the point in replacing the cap is. Does it leak? Is it physically damaged? It has nothing to do with the cooling of your engine. It just keeps the coolant from leaking out and maintains pressure.
You could also be cavitated. When replacing the coolant, there are air pockets in the engine head that hold air. And your engine will overheat. If you are cavitated, you'll see the coolant level drop when you run without the cap when you do the test above. Just add more coolant directly to the radiator if that happens and you should be good to go.
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Well Blue said you could have a cap that only holds 1psi....
FYI I checked the coolant from the overflow tank.