I'm repairng a freinds cars that was over heating. There it was shy 1 gallon of water. I replaced the thermo and filled it up with distilled water. After heating up, there is white foam and coolant being presured out of the upper radiator hose and ton of white foam on the radiator cap and hole.

I ran a compression test before leak down and after. Here are the results:

Before 90W was added:
180 180 170 180

After 90W was added:
210 190 190 190

I'm suspecting a head gasket, but I'm unsure what to think about the leak down results. The oil looks just fine. The white foam doesn't feel that oily. Any suggestions? And no, I did not add Mr. Bubbles to the coolant.

 

check the oil to see if there is coolent in the oil,, im not sure about the white foam it may just be the water boiling? when you wipe the white foam what color does it dry?

 

The engin oil looks clean. The water the dumps out does not feel or smell like the engine oil. The radiator has dual cooling with auto-tans fluid going through it. The dried cooling water isn't real oily, but I smells similar to the auto-tans fluid. I have this feeling that there might be an internal leak in the radiator. The water just feels suspicious.

 

dual cooling? wtf is that? You have automatic? On automatic or aftermarket radiator they have the optional line for the atf lines to be ran to the transmission.

As far as the foam, If you suspect everything is good with the motor. Pressure test the system check for leaks. Make sure you bleed the system correctly. Turn your heater on when you bleed the system and let all the air bubbles out so that coolant air does not get traped in the system. Usually a foamy residue is a indicator of a blown headgasket. How hot did this car get? Why are you performing a leakdown test for fixing a coolant problem?