Both tests will tell you if you have a bad headgasket or head.
That mechanic that syas its the head I wouldnt take it back to him, I dont trust him. The test im having u do with the air compressor is a simple scale of it you can do yourself.
The head gasket keeps the coolant sperate from the pistons so it doesnt burn off hte antifreeze. If its blown it allows it to seep into the pistons, by using compressed air into the cylinders it pressureizes the piston and if there is any cracks the air will go to the coolant and come out of the hoses where u will see bubbles.
But since you havnt noticed any weird idle or runnign problems then I wouldnt be surprised if the head gasket is good.
I think were looking at a cracked or improperly tightend hose.
Saturday, November 10th, 2007 AT 5:12 PM