Vent/Bi-level/defrost
Thread Starter
Instructor
Joined: Jan 2012
Posts: 176
Likes: 25
From: Plainfield Illinois
Vent/Bi-level/defrost
86 with manual slide Climate controls
It does switch from hot to cold, but it is stuck in between all three (vent defrost and down by the feet). I have air coming out of all three. I checked vacuum at the motor (near front of distributor) and on the interior and I do have vacuum but I did not put a gauge on it. (No access to one)
I pulled the dash pad out and Radio/heater controls... when I looked through the vent and switch it from vent to defrost I can see the flap start to move but does not go all the way. I can push it manually, but just goes back to the middle.
My question is... is it possible I do not have enough vacuum or is there something mechanical wrong inside the dash like an actuator or blend doors?
it looks like one plastic line goes from the t fitting at back of manifold, inside the harness and into the car. At some point, it looks like it tees into 2 black lines
It does switch from hot to cold, but it is stuck in between all three (vent defrost and down by the feet). I have air coming out of all three. I checked vacuum at the motor (near front of distributor) and on the interior and I do have vacuum but I did not put a gauge on it. (No access to one)
I pulled the dash pad out and Radio/heater controls... when I looked through the vent and switch it from vent to defrost I can see the flap start to move but does not go all the way. I can push it manually, but just goes back to the middle.
My question is... is it possible I do not have enough vacuum or is there something mechanical wrong inside the dash like an actuator or blend doors?
it looks like one plastic line goes from the t fitting at back of manifold, inside the harness and into the car. At some point, it looks like it tees into 2 black lines
Last edited by OVRPWRD; May 23, 2017 at 02:47 PM.
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
I looked through the vent and switch it from vent to defrost I can see the flap start to move but does not go all the way. I can push it manually, but just goes back to the middle.
My question is... is it possible I do not have enough vacuum or is there something mechanical wrong inside the dash like an actuator or blend doors?
My question is... is it possible I do not have enough vacuum or is there something mechanical wrong inside the dash like an actuator or blend doors?
This also means tracing your hose all the way back to the engine tee; if you don't have good vacuum off the engine and hoses, none of your flaps will open properly.
Your vacuum canister could be going bad or have a torn membrane. Could be but probably not. Grab hold of the flapper and move it back and forth to free it up and make sure you have freedom of movement.
You need a vacuum gauge. It is a super handy tool.
Last edited by billschroeder5842; May 23, 2017 at 05:09 PM.
Thread Starter
Instructor
Joined: Jan 2012
Posts: 176
Likes: 25
From: Plainfield Illinois
I have strong vacuum at the T. I traced it to the firewall where it is behind the distributor but can't get to it because it is too tight and it goes into the wire loom. I found what I think is the line inside the car, passenger foot well, but it is a double plastic line???
does it t-off into 2 separate lines in the wire loom or do I not have the right line??
And only one of the 2 lines has vacuum, and it seems very weak .
Going to get a vac gauge and start checking.
Kind of annoying, everything works on this car, just converted the AC to 134a, but I want the vents to work properly too.
does it t-off into 2 separate lines in the wire loom or do I not have the right line??
And only one of the 2 lines has vacuum, and it seems very weak .
Going to get a vac gauge and start checking.
Kind of annoying, everything works on this car, just converted the AC to 134a, but I want the vents to work properly too.
Team Owner
Joined: Sep 2003
Posts: 25,394
Likes: 2,741
I have strong vacuum at the T. I traced it to the firewall where it is behind the distributor but can't get to it because it is too tight and it goes into the wire loom. I found what I think is the line inside the car, passenger foot well, but it is a double plastic line???
does it t-off into 2 separate lines in the wire loom or do I not have the right line??
And only one of the 2 lines has vacuum, and it seems very weak .
Going to get a vac gauge and start checking.
Kind of annoying, everything works on this car, just converted the AC to 134a, but I want the vents to work properly too.
does it t-off into 2 separate lines in the wire loom or do I not have the right line??
And only one of the 2 lines has vacuum, and it seems very weak .
Going to get a vac gauge and start checking.
Kind of annoying, everything works on this car, just converted the AC to 134a, but I want the vents to work properly too.
Last edited by WVZR-1; May 23, 2017 at 07:43 PM.
