Coolant Pressure Cap Stuck

Most radiator pressure caps keep the system pressure at 16 psi so the engine coolant can get considerably hotter without the fear that it will boil off.

Coolant pressure cap stuck. Check to see if the radiator has holes in it or if the cap looks worn or damaged. If the radiator cap is stuck the proper amount of coolant cannot be released appropriately and this causes coolant temperature and coolant pressure increasing. The radiator cap seems like a very simple device that has no other use than being a stopper for a hole. The radiator cap is actually much more important than that.

On the other hand if the pressure was allowed to increase above 16 psi the cooling system including the hoses and. Leaked coolant stays in between the radiator upper tank and the radiator upper body. If the radiator cap is stuck pressure may build inside of the radiator which could cause cooling system components to leak or burst. The coolant used to cool the engine does so at maximum efficiency when kept at specific pressure.

The radiator cap is designed to allow access to fluids in a closed system. If there is no pressure in the cooling system the coolant will boil off. That said you must press down the cap about 1 4 or so to disengage the a. If so then replace the cap.

Well first rule always make sure the cooling system is cool and not hot as it will be pressurized with boiling hot water and cause severe injury opening it in that state. A radiator cap is used to keep water or coolant inside of the radiator but it is also in place to relieve pressure if the temperature of the coolant is too high. Check your owner s manual for proper cap replacement.