Radiator coolant leak

Asked by GuruCY24J Feb 08, 2019 at 08:58 PM about the 2005 INFINITI G35 Sedan RWD

Question type: Maintenance & Repair

My car infinity G35/2005 leaks at the radiator cap when I stop it. I installed a new cap.  The car was leaking before showing spots on the drive way. What can cause the leak at the radiator cap?  Does it indicate thermostat is stuck?

2 Answers
870

dan answered 5 years ago

Radiator caps have a pressure rating, pressure exceeds this rating and they relieve the pressure....so, you have a pressure build up in the system. It could be as simple as being overfull and no room for coolant to expand while hot or it could be something as bad as a bad head gasket allowing combustion chamber pressure into the cooling system.

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