[Mike V. Florida]

Originally Posted by Tom Wesenberg

I would suspect a leaking head gasket. I use regular antifreeze and don't have foaming. Fill the radiator to the top, then connect a hose from the bottom end of the overflow pipe to the bottom of a gallon jug half filled with water. Put the car in neutral and snap the throttle open several times while watching the jug for air bubbles.

Or, if you are close to a shop such as Mitch has, then you could have them check for exhaust gases in the radiator by using an electronic sniffer.

Autozone has a loan a tool service. Other parts houses may have the same.

http://www.autozone.com/loan-a-tools...er/391378_0_0/