1982 AC / Heater / Blower not working
Thread Starter
7th Gear
Joined: Apr 2018
Posts: 7
Likes: 1
From: Gilbert AZ
1982 AC / Heater / Blower not working
I have seen a couple of related threads but need to start a new one as my schematic and problem are unique. Problem description: climate control not working. I have not found a schematic that matches my car so I am at a bit of a disadvantage. The Haynes manual is worthless. Here is what I have found; the power to the brown wire going to the control switch fluctuates 5v +/- .5v, but there is 12 v at both sides of the fuse for the A/C. Contrary to some schematics, I don't have a brown wire at the resistor; there is light brown, light blue, tan, and yellow. I have to assume the brown wire is in parallel with some other circuit, or perhaps has a short, but am hoping someone can shed light as I don't have a reliable schematic.
So we don't get sidetracked, I have tested the blower, blower switch, relay, and resistor and all are working. I ohmed out the control switch and it appears to be working as well. I am assuming I need 12 v on the brown wire at the control switch.
Thanks in advance, I can upload photos as needed.
So we don't get sidetracked, I have tested the blower, blower switch, relay, and resistor and all are working. I ohmed out the control switch and it appears to be working as well. I am assuming I need 12 v on the brown wire at the control switch.
Thanks in advance, I can upload photos as needed.
Pro
Joined: Oct 2017
Posts: 571
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I’d start with the blower operation. Turn key all the way forward for ACC power. Slide both heater controls on the console to right, put the blower on high. You should now hear the blower run. If not check purple (12v) and black ground at the blower (pass side front of heater box). If no power at the blower motor, work your back, checking the 25a fuse first and then the heater relay. It’s really a simple circuit, just need to work your way back until you find the issue.
Once you get blower and heater working tackle the AC.
Once you get blower and heater working tackle the AC.
Last edited by TorchZ51; Dec 27, 2021 at 07:13 PM.
Thread Starter
7th Gear
Joined: Apr 2018
Posts: 7
Likes: 1
From: Gilbert AZ
Thank you Skids. Couple of questions. Can you tell me where you got this schematic, and where does the yellow wire from the resistor pack come from?
If the problem is the back side of the fuse box, I'll be doing without AC.
C
If the problem is the back side of the fuse box, I'll be doing without AC.
C
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Melting Slicks
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From: Fleming Island, FL
The yellow wire comes from HVAC mode switch, buss #51. The wiring diagram is a lectric limited from eBay. It's okay but hard to read the cavity numbers. Getting to the back of the fuse box isn't all that difficult. Once you get that brown wire powered up everything should start working.
Safety Car
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Thread Starter
7th Gear
Joined: Apr 2018
Posts: 7
Likes: 1
From: Gilbert AZ
Thread Starter
7th Gear
Joined: Apr 2018
Posts: 7
Likes: 1
From: Gilbert AZ
I’d start with the blower operation. Turn key all the way forward for ACC power. Slide both heater controls on the console to right, put the blower on high. You should now hear the blower run. If not check purple (12v) and black ground at the blower (pass side front of heater box). If no power at the blower motor, work your back, checking the 25a fuse first and then the heater relay. It’s really a simple circuit, just need to work your way back until you find the issue.
Once you get blower and heater working tackle the AC.
Once you get blower and heater working tackle the AC.