My brain seems to have skipped a groove in my first reply: Usually the most basic check to ensure your A/C is OK is to see if water condenses from the atmosphere on the low side. Has anyone tried this on a D with its long run to the rear? I won't see my own car until Saturday afternoon -- will try myself then. Bill Robertson #5939 (wish me luck -- I'm going to try to replace the passenger side exhaust manifold gasket before driving south...) > I have yet to do final checks, but I am now 99% certain that it is a > vacuum leak problem as it seems to be the actual flow of air through the > center vent that is affected. In other words if you select 'vent' or > 'norm' or 'max', the same symptoms appear, so that seems to rule out a > specific airconditioning problem