Defective cap? Bad thermostat building excessive pressure
A coolant pressure test is used to detect a leak on the coolant system.
Have the coolant system pressure tested, the pressure test will increase the coolant leak.
If you do not visibly see a coolant leak, have the cooling system pressure tested. If the leak is not obvious it could be internal.
Mine is in the timing chain cover gasket. You can find your leak by pressure testing your coolant system.
Have it pressure tested and repair the leak.
Yes, if it is not holding pressure or is allowing a coolant leak.
Pressure test system to determine where leak originates
Coolant leak, possible heater core. Suggest to have it pressure tested to find leak.
You would have a leak in the coolant system somewhere and you need to have the system pressure checked.............
Have it pressure tested, the intake gaskets have probably failed.
If you're adding coolant to the reservoir often, you have a leak somewhere. Have the cooling system pressure tested. That may force the leak to show up.
First pressure test system to determine where leak originates