Hi Ap577
Yes in most cases it is in fact a faulty vacuum line (even for the late model vans (96+))..The most problematic is the one running along the front of the engine from the drivers side over to the heater control valve (passenger side below the heater core itself near the frame rail (just above it)).
Make sure they are hooked up properly and none of them have any cracks in them.. The vacuum lines I'm referring to are the small, thin, hard black ones.
Here is a late model diagram with rear ac. If you don't have rear ac, then just disregard that part of it:
download/file.php?id=913" onclick="window.open(this.href);return false;
Yes in most cases it is in fact a faulty vacuum line (even for the late model vans (96+))..The most problematic is the one running along the front of the engine from the drivers side over to the heater control valve (passenger side below the heater core itself near the frame rail (just above it)).
Make sure they are hooked up properly and none of them have any cracks in them.. The vacuum lines I'm referring to are the small, thin, hard black ones.
Here is a late model diagram with rear ac. If you don't have rear ac, then just disregard that part of it:
download/file.php?id=913" onclick="window.open(this.href);return false;
