Need help locating vacuum leak
My 01 Ram with the 5.2L has 77,000 miles on it. It recently had the plenum repair done at the dealer as well as the transmission service and check valve replacement. I called the dealership today and stated that the check valve replacement at the firewall did not solve the problem. When accelerating moderately above 40mph up an overpass with the A/C or Vent on high, the air flow goes from the mid level air vents to the defrost. When I decelerate, it is fine.
The dealership rep stated that there is a second check valve that is probably the culprit and several 2000 and 2001 Rams have the problem. Can someone show me a picture or detail location so I can change the check valve?