blower switch stuck
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New User
Joined: Jul 2005
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blower switch stuck
Greetings one and all,
I have a 1998 F-150. The a/c control switch is stuck in the floor/def. mode. That is I can turn to any indicator position but it still blows out the floor/def area. Any ideas on how to fix it.
I have a 1998 F-150. The a/c control switch is stuck in the floor/def. mode. That is I can turn to any indicator position but it still blows out the floor/def area. Any ideas on how to fix it.
Lead Driver
Joined: Jul 2003
Posts: 7,404
Likes: 52
From: Wheatland, Mo
Is the switch itself stuck in that position and the **** is just spinning on the switch shaft? Or is the switch actually changing positions just not doing anything for the air flow? If it’s the first problem...you may just need a new ****. If it is the second, then it could be the switch itself is messed up internally and could just need a new switch, or there is a vacuum line that is either disconnected or broken. Also, check the vacuum block that is on the firewall on the passenger side right behind the battery. Someone else had a prob with the airflow and it turned out to be that block on the firewall. Do a search in this forum for AC. It was last week that it was posted. You may be able to scan back about 2 pages and find it. Here is what was posted back to me in an email about it.
"I guess it was the vacuum reservoir after all. It's weird though;
When we first replaced it, the problem was still there, but yesterday
when we took the wheelers out for a test ride for the upcoming trip, the
A/C worked like a charm. It never changed from vent to defrost one
time. Before, it would have changed as soon as you started up a hill with
a load on the truck. Maybe it hadn't had time to build up vacuum when
we first did it."
"I guess it was the vacuum reservoir after all. It's weird though;
When we first replaced it, the problem was still there, but yesterday
when we took the wheelers out for a test ride for the upcoming trip, the
A/C worked like a charm. It never changed from vent to defrost one
time. Before, it would have changed as soon as you started up a hill with
a load on the truck. Maybe it hadn't had time to build up vacuum when
we first did it."
Last edited by BillyBob69; Jul 20, 2005 at 01:19 PM.
FTE Leadership Emeritus
Joined: Jan 2003
Posts: 161,999
Likes: 75
From: 3rd Rock
Originally Posted by smal0297
Greetings one and all,
I have a 1998 F-150. The a/c control switch is stuck in the floor/def. mode. That is I can turn to any indicator position but it still blows out the floor/def area. Any ideas on how to fix it.
I have a 1998 F-150. The a/c control switch is stuck in the floor/def. mode. That is I can turn to any indicator position but it still blows out the floor/def area. Any ideas on how to fix it.
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New User
Joined: Sep 2005
Posts: 1
Likes: 0
b3000 vacuum lines
Originally Posted by PaulC
For safety reasons, the HVAC system defaults to defroster mode if the vacuum needed to operate the system isn't present.
i had to replace the heater core..
1995 b3000(95 ranger) dam 8 hours later had it back together..
had to remove dash..to get at the core..
and if i didnt put the vac hose on backwards...was very worried but then read that..defaults to defrost..
great thanks a million..
P
