Current situation: Vents stuck in default defrost/floor, with hissing noice when selector is in "floor" mode.

Last night I checked the operation of the vent to floor actuator (Drivers side under dash), this actuator has two vaccum lines....brown and gray I believe. One pulls up the other pulls down, with the default in the middle. I am 90% sure that my problem lies in the supply of vaccum to the Hvac controls, maybe a broken line. I have checked the line to the ball under the hood, looks good and shows good vaccum.

My question is this: Does anyone know the actual routing of the supply line, like where it passes through the firewall? Anyone had similar issues, and what was the fix?

Thanks!

 

I've got a similar problem with mine. Stuck in vent. Wont blow on the floor or the defrost.
Hopeing to look at it this weekend.

 

Any update? Mine is no better......

 

I just solved this issue.

There is a bank of solenoids behind the ashtray. For me, the solenoids failed.

If your climate control has an “Auto� setting, you also have these solenoids.
The service manual directs you to either the a/c control head unit or the solenoid bank. I was unable to determine which, so I purchased both parts and tested each to determine it was the solenoids.

 

What is the ball under the hood

 

It is the vacuum reservoir, but you could have asked this in your thread...

 

Could a problem with that be why my vents are not working right

 

Could, but that is why you have your other thread on that subject.

 

hey MR ADMINISTRATOR, i have been looking at some of your postes and you talk to everybody like you are the king of the forum or the forum police , maby you are, who am i to judge. 19,174 posts wow you must have alot of spare time, how is that going anyways , i dont want to take up to much of your time, you probably have to take your medacation, yours truly (x forumer) john

 

That was random, thats what moderators do buddy