on my truck the overflow keeps filling all the way up with antifreeze u can hear it bubbling in the passanger side dash that would be the heater core right?? i need to get it fixed asap thanks 4 any input...
Its a cheap start to finding the problem... I would replace it... It must hold the rated pressure for at least a few mintues...Cummins5390 said:i pressure tested the raditor cap and it dosent hold 15 psi at all it drops to about 12 psi thats not good right?? could be the cause??