Quote:
Originally Posted by burn_this_city
You can run straight water in your radiator. Glycol just prevents it from freezing. What raises the boiling point is the system rising to 14-16 psi as the temperature increases. Hence the explosion of coolant if you open the cap when hot.
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You can but it's not good. The crap in antifreeze stops the acid values of water and protects the water jackets.
Okay most thermostats stick open for a fail safe feature.
If it is bubbling you have a vacuum leak. Either rad cap or bad hose. That means the pressure in the system is at atmospheric pressure which boils faster that a system under pressure.
Go to an local parts store and rent a pressure tester and BLAMO test it. Rad cap is my bet. Could be a bad radiator and such.
Edit.
I thought for some reason I read Subaru.