I have vacuum tested the supply line to the dash,the vac reservoir, and vac check valve , all ok.

The problem is that the ac output is sufficient until driving at highway speeds but then goes to the defrost;just like a vacuum leak.

I have searched the archiv...

FIX posted 7/8/2005

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle