BigPapa
TDR MEMBER
Also got a vacuum problem recently. If it's really hot outside after about an hour of driving the door that switches from vent to defrost switches and it will only blow out of the defroster. Once I park it for a while and everything cools off it goes back to working.
Check the rubber elbow on the vacuum pump. It may be cracked or swelled up and won’t seal when it gets hot. You can replace it with a Dorman 47092. I know O’Reilly’s has them for less than $10. The hard plastic lines will break if you look at them hard. You can use air brake tubing to replace it and vacuum hose to splice them.
You can put 2 seals in the same bore? You have my attention on this hack.
Yes, sir, at least on the 5.9’s.