A/C Door
Thread Starter
|
Posting Guru
Joined: Apr 2006
Posts: 1,274
Likes: 1
A/C Door
I'm still having troubles with my A/C. I have it narrowed down to the door that lets the air from the pax foot well in to the A/C system. When I switch from Norm to Max A/C, The outside air door closes, But the footwell door doesnt open. My question is, where is the actuater for that door? There is one under the right hood hinge. Would that be it? Probubly not, because it's too eazy to get at.
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
The air vane under the dash is controlled by a vacuum pot up under there near centerline of the truck. It should open to the dash vents when either A/C setting is selected. The outside door closing in the MAX position is correct. The MAX setting recirculates the air in the cabin to make keeping it cool easier on the system. I'm not sure about a 90 model but I know my 92 and others often have the BLACK/BLUE vacuum line at center under the dash come loose causing every setting to blow through the defrost vents.
Thread Starter
|
Posting Guru
Joined: Apr 2006
Posts: 1,274
Likes: 1
In norm, it works fine. When I switch to max, air doesnt come out anywhere. There must be a door (or two) that goes from outside air to foot well air. But I have never took one of those air boxes apart to see how they are routed. Does anyone have a good drawing? My manual is at home. But I dont think it shows it good anyways. I'll be home in a couple days. (unless I have to work over for the oilslick) Its like 92 here in Louisiana and the "norm" dont cut it.
Fleet Mechanic
Joined: Sep 2003
Posts: 1,716
Likes: 15
Does the '90 have separate outside air and recirculate doors?
All the full-size Ford products I've had, including my '94 Bronco, have only one outside-air/recirculate door.
In the no-vacuum position, one face of the door closes over the passenger compartment inlet under the dash, so the outside air inlet is open. When vacuum is applied to the vac motor by the right hood hinge, the door swings over so it's other face blocks outside air, which means it isn't blocking off passenger compartment air anymore.
In the vacuum (recirculate passenger compartment air) position, I can look through the air inlet under the dash with a light, and see the blower wheel. And I can see that side of the door, sort of on-edge, because it's swung over to block the outside air inlet.
So I don't understand what you found, unless a '90 really does have two separate doors that have to be worked opposite.
All the full-size Ford products I've had, including my '94 Bronco, have only one outside-air/recirculate door.
In the no-vacuum position, one face of the door closes over the passenger compartment inlet under the dash, so the outside air inlet is open. When vacuum is applied to the vac motor by the right hood hinge, the door swings over so it's other face blocks outside air, which means it isn't blocking off passenger compartment air anymore.
In the vacuum (recirculate passenger compartment air) position, I can look through the air inlet under the dash with a light, and see the blower wheel. And I can see that side of the door, sort of on-edge, because it's swung over to block the outside air inlet.
So I don't understand what you found, unless a '90 really does have two separate doors that have to be worked opposite.
Thread Starter
|
Posting Guru
Joined: Apr 2006
Posts: 1,274
Likes: 1
I did not say there was two doors. I didnt know. I still dont, but I found the problem. On another site a guy said the main problem with the system is the small white vacume hose going to the actuator under the right hood hinge. You cut it 1 or 2" out of the loom and replace with 1' of 3/32" vacume hose. I did it and viola, it works. I couldnt see where the white hose was bad. The guy on that site said the white hose brakes down from heat and ultra vileot rays. (it was crusty)
Thread
Thread Starter
Forum
Replies
Last Post
muneeb
Explorer, Sport Trac, Mountaineer & Aviator
1
Apr 25, 2016 07:45 AM
hotfalcoon
1997 - 2006 Expedition & Navigator
14
Dec 4, 2015 05:13 PM
