My vents are stuck to defrost position no matter what i chose. Ive done some research and looked at my pump. It turns on when power is applied. I pulled the vacuum hose running to the firewall and heard a hiss from the vacuum pump side. I have warn hubs and dont know if they're vacuum operated or not. I always manually move them. I did have a free flying line that i repaired on the passenger hub. Still no luck. Any help is appreciated
Follow the vacuum hoses up from the knuckles all the way to the pump. Then plug it off at the pump. Also there is a vacuum connection right under the glove box that sometimes gets disconnected.
Take the lines off the vacuum canister and plug them and see if the pump fills it and shuts off. If yes then reconnect the cabin vacuum line and see if it runs and shuts off if yes hook up your esof valve and see what happens. My esof valve was leaking so I had no vacuum and stuck on defrost.
Chased all my vacuum lines and tracked it down to the egr valve solenoid. Saw it named a few other things. Replaced it and bam, problem gone. Thanks for the help everyone
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