eze's h1
#21
Vacuum pump lines are probably getting brittle, causing low vacuum pressure. Which is what operates the blend door. The Vacuum Pump is on the front of the engine driven by the serpentine..
Replacing the vac pump on the 6.2/6.5's is very common. They also control the wastegate on the 6.5's..
Replacing the vac pump on the 6.2/6.5's is very common. They also control the wastegate on the 6.5's..