coolant boiling out of resorior


Asked by Jan 22, 2015 at 08:21 PM about the 2006 BMW 7 Series 750Li

Question type: General

changed themastat  car still over heating coolant boiling out of coolant bottle cap

4 Answers


Radiator cap might also be bad, if it can't maintain adequate pressure and allows coolant to overflow at lower temps than normal. But if it is 'boiling over,' then you might want to have the radiator fluid tested for carbon compounds indicative of a blown head or intake gasket. NAPA sells something called a "combustion leak block tester." (escaping combustion gases are leaking into the coolant and causing it to boil and overflow.)


Did you bleed the air out of the coolant system?

Check your water pump.


Bleed your cooling system

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