AC/Heater vents
Thread Starter
|
New User
Joined: Jul 2003
Posts: 16
Likes: 0
From: Eastern NC
AC/Heater vents
1985 Ford F-150 with 302 EFI. Their is little or no air comming out of the defroster when selected. It seems that the majority of the air comes out of the vent regardless of the position that is selected, but that is a very small amount also. Can anybody help?
Senior User
Joined: Dec 2002
Posts: 149
Likes: 0
From: Huntsville USA
AC/Heater vents
I had the same problem in my 84
If you pull the cover off of you heater core and look just to the left of it, inside the duct work, you'll see a door. This door is driven by a vacuum motor that is controlled by the heat/air selector switch.
The vacuum motor could be bad, but if it's like mine, the problem is the that door. It has a film hinge on it, and over the years it breaks.
While I had the heater core cover off, I was able to see the door flop around when I switched between the AC and heat/defrost settings.
I was able to position the door correctly to divert the air to the floor/defrost vents. If I moved the control to switch to dash vents, the arm would pull on the door, and the door would switch to the dash.
If I tried to go the other way, the arm would push, the door would flop around and nothing changed. My temporary solution to get through winter was to position the door to heat/defrost, and never switch to panel.
I'm hoping to get around to fixing it this summer. I'm either going to try to rig a new hinge, or preferrably find a new assembly and replace it. I just dread trying to pull all of that duct work out of there to replace it.
Rick
If you pull the cover off of you heater core and look just to the left of it, inside the duct work, you'll see a door. This door is driven by a vacuum motor that is controlled by the heat/air selector switch.
The vacuum motor could be bad, but if it's like mine, the problem is the that door. It has a film hinge on it, and over the years it breaks.
While I had the heater core cover off, I was able to see the door flop around when I switched between the AC and heat/defrost settings.
I was able to position the door correctly to divert the air to the floor/defrost vents. If I moved the control to switch to dash vents, the arm would pull on the door, and the door would switch to the dash.
If I tried to go the other way, the arm would push, the door would flop around and nothing changed. My temporary solution to get through winter was to position the door to heat/defrost, and never switch to panel.
I'm hoping to get around to fixing it this summer. I'm either going to try to rig a new hinge, or preferrably find a new assembly and replace it. I just dread trying to pull all of that duct work out of there to replace it.
Rick
New User
Joined: Jul 2003
Posts: 3
Likes: 0
From: mts of virgina
AC/Heater vents
i just did a full change over on my 83 f150 from no ac to ac and the duct work is not the bad to change the hardest part about it is the two bolts next to the front fender in side the engine compartment other than that it only took a few hours every thing is interlocking so if all u r doing is the change over should be real quick
Thread
Thread Starter
Forum
Replies
Last Post
jennshusbum
1999 - 2003 7.3L Power Stroke Diesel
8
Jul 26, 2014 10:07 AM
78RangerXLT
Cooling, Heating, Ventilation & A/C
2
Nov 30, 2002 11:20 PM
