2006 E450 AC problem - FIXED
So, my AC defaults to defrost when I loose vacuum. I know what you are thinking, the check valve in the vacuum tank. Maybe, but not. Here is the info: 1) I check the pressure in the black line going...
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Only thing left would be the actual fitting the vacuum hose connects to...either the fitting is cracked, or if it screws into the manifold, it's leaking past the threads...hope you find it!
