Blower fan switch
Thread Starter
Instructor
Joined: Jul 2002
Posts: 161
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From: Urbana IL
Blower fan switch
The blower fan in my '84 won't work in high position, works fine in the lower three. Do I need a new switch, or is it something else, is it hard to fix? Thanks for any insights.
Burning Brakes
Joined: Sep 2000
Posts: 1,199
Likes: 1
From: NewCastle IN. USA
Re: Blower fan switch (buzzbomb)
I had a simular problem on my 86, it turned out to be the blower motor relay (mounted on firewall near blower on the 86). can't say for sure if thats your problem , but it sounds like it. you could find it by having someone turn the switch to high and back down while you listen for the click of the relay.
RJ
RJ
Instructor
Joined: Jan 2002
Posts: 221
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From: League city Texas
Re: Blower fan switch (buzzbomb)
If the fan works in all other positions except for high, the problem will be in the blower fan resistor network mounted on the evaporator housing. It's not hard to get to, just one wire harness to disconect and two screws to remove, swap in new one installation is the reverse of removal.
- 1986 Original Owner -
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From: North Yorkshire, England
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Re: Blower fan switch (trupp)
If the fan works in all other positions except for high, the problem will be in the blower fan resistor network mounted on the evaporator housing.
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Thread Starter
Instructor
Joined: Jul 2002
Posts: 161
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From: Urbana IL
Re: Blower fan switch (JonM)
It looks like the switch and the relay work, I think the hot for the fan high position is at fault, and may be getting 9 volts if Ive found the right pin. Does anyone no where the fusible link for the fan high hot wire is located? Thanks, Dave
-----------4------
--1--2----------3
-----------5------
The relay block looks like this, I have 12 volts at pin 4 with the fan switched to high, 0 with it on other settings, pin 5 seems to be the ground for the relay switch, pin 3 is the ground for the fan. I think pin 1 is the fan low to med power, and pin 2 would be the high power lead for the fan. It is pin 2 that only has 9 volts with the relay removed. Does anyone know where this wire goes and what connectors/ fusible links could be at fault? I appreciate all the help, Thanks
[Modified by buzzbomb, 3:22 AM 8/14/2002]
[Modified by buzzbomb, 3:24 AM 8/14/2002]
[Modified by buzzbomb, 3:25 AM 8/14/2002]
-----------4------
--1--2----------3
-----------5------
The relay block looks like this, I have 12 volts at pin 4 with the fan switched to high, 0 with it on other settings, pin 5 seems to be the ground for the relay switch, pin 3 is the ground for the fan. I think pin 1 is the fan low to med power, and pin 2 would be the high power lead for the fan. It is pin 2 that only has 9 volts with the relay removed. Does anyone know where this wire goes and what connectors/ fusible links could be at fault? I appreciate all the help, Thanks
[Modified by buzzbomb, 3:22 AM 8/14/2002]
[Modified by buzzbomb, 3:24 AM 8/14/2002]
[Modified by buzzbomb, 3:25 AM 8/14/2002]
