Switching to defrost does not work
Thread Starter
|
Tuned
Joined: Aug 2008
Posts: 276
Likes: 9
From: Alaska (not Anchorage)
Yes, that is the case. When in defrost no air is coming out of dash or floor vents.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Would it be possible that something is physically blocking the duct immediately past the door? I can't think of anything mechanical or electrical that could cause your issue if that door is opening and closing when it's supposed to. Unless the dood as come undone from whatever shaft or arm it pivots on.
Thread Starter
|
Tuned
Joined: Aug 2008
Posts: 276
Likes: 9
From: Alaska (not Anchorage)
Would it be possible that something is physically blocking the duct immediately past the door? I can't think of anything mechanical or electrical that could cause your issue if that door is opening and closing when it's supposed to. Unless the dood as come undone from whatever shaft or arm it pivots on.
To eliminate one possibility, I have ordered a Motorcraft blower fan. I replaced the fan last April with a fan purchased from the local O'Reilly store. Air coming out of heater and dash vents seems sufficient, but now I am wondering if it is diminished as well. I'll check back after I've swapped in the new fan.
Laughing Gas
Joined: Jun 2013
Posts: 1,097
Likes: 514
From: Yokosuka Japan
probably the arm that goes from the shaft that the vacuum dash-pot pushes against. the same year F150's have an issue with that plastic arm cracking and the symptoms are identical to what you are describing. need to pull the dash and pull apart the air movement box to get access to the arms to find out if it has cracked or not. then you have to see if ford even offers the part anymore. if not its jb weld and whatever chicanery you can come up with to fix the arm.
Cargo Master
Joined: Apr 2022
Posts: 3,195
Likes: 1,698
probably the arm that goes from the shaft that the vacuum dash-pot pushes against. the same year F150's have an issue with that plastic arm cracking and the symptoms are identical to what you are describing. need to pull the dash and pull apart the air movement box to get access to the arms to find out if it has cracked or not. then you have to see if ford even offers the part anymore. if not its jb weld and whatever chicanery you can come up with to fix the arm.
Thread
Thread Starter
Forum
Replies
Last Post
jimbomitch
1968-Present E-Series Van/Cutaway/Chassis
8
Jul 5, 2020 05:43 AM
Dkrowland81
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
13
Nov 16, 2010 01:30 PM
