Why does it boil and overflow out of the resevoir tank? The car isn't overheating at all. Normal running temperature. Is there too much water/coolant? Even when it was low it would do that. But not before I re-routed the return tube to the side of the radiator. There are no leaks at all where I put the hose at.

Maybe a bad radiator cap?

 

Radiator cap it is. A nice shiny new one should solve this problem.

 

That's what I was hoping it was. Why do they go bad?

 

Mine went bad from years of opening/closing the radiator -- the rubber seals were not longer pliable and were leaking.

 

*sigh*

Glad to hear that b/c i heard through some other's that it could be a head gasket leak causing the it boil.

 

Yup Radiator cap.