cooling system problem

HEAD GASKET!

 

had exact same prob, many years ago. $1500 total cost.

 

We do head gaskets on detroits all the time and we can generally get one in and out in two days for about 1250. That's given all that it needs is the head gasket set as far as parts go.

 

The air output line is all you disconnect

 

Yep, just the air outlet line.

 

You need to disconnect the coolant lines from the compressor. You are isolating it so as to rule out air pressure in the cooling system. If coolant is still travelling thru the compressor it isn't isolated

 

I thought I explained that in my previous post. What you are trying to accomplish is to see if the source is a blown head gasket in the compressor or of they are coming from elsewhere. To do this you need to remove the compressor completely from the system by removing the coolant lines. It you have coolant running thru the compressor, and it has a blown head gasket it will put air into the system. Also if you have a coolant system pressure gauge you can see what kind of pressure you are building. Also to help you out does the bubbling start immediately. Or does it begin after a few minutes. To check for a blown head gasket you can get an exhaust gas in coolant tester. Napa has it I know. You fill the tube with the blue liquid and then use the pump. If you have gas in the coolant it will turn green and eventually yellow. You have to do it with the truck running and the coolant should be around 170 or better. Also high idle., though if its bad enough that doesn't matter. If you have a vented neck on the surge tank where the cap spins on you need to plug those vents. Use duct tape or something similar. You need to have a tight seal between the tester and the tank.