A/C Fan resistors
Thread Starter
Banned Scam/Spammer
Joined: Jun 2006
Posts: 364
Likes: 3
From: Monroe Washington
A/C Fan resistors
I have a 1986 coupe that I am trying to figure out why my A/C fan only works on high. Obviously the high fan relay is working as its the only position the fan runs in. I pulled the resistor panel and measured the coils, no opens, they appear to be okay. Is there anything else to check? Coulod the actual switch be bad on the other two positions??
Instructor
Joined: Nov 2003
Posts: 126
Likes: 2
From: Belmont MI
I just fixed this same issue on my '85. I threw parts at it until it was fixed.
First I changed the resistor, this did nothing. It still only blew on 'hi'. That was $20 donated to the General. Next I changed the relay and that did it. It now blows on all 4 speeds just like it should. The relay is located on the firewall below the blower, behind the passenger wheel well. Its a little tight to fit it on there, but it is a 5 minute job or less if all goes well. I put a little dielectric grease on it to help it slide into place. This part was $11.
The manual diagnostic says to look at the resistors and the relay if you only get 'hi' speed. 'Hi' speed works because at that selection, 12 volts is being sent directly to the blower motor.
Hope this helps.
First I changed the resistor, this did nothing. It still only blew on 'hi'. That was $20 donated to the General. Next I changed the relay and that did it. It now blows on all 4 speeds just like it should. The relay is located on the firewall below the blower, behind the passenger wheel well. Its a little tight to fit it on there, but it is a 5 minute job or less if all goes well. I put a little dielectric grease on it to help it slide into place. This part was $11.
The manual diagnostic says to look at the resistors and the relay if you only get 'hi' speed. 'Hi' speed works because at that selection, 12 volts is being sent directly to the blower motor.
Hope this helps.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Melting Slicks
Joined: Aug 1999
Posts: 2,240
Likes: 42
From: Baltimore, MD USA
Originally Posted by AGENT 86
Agent 86 you need to post the C60 Blower schematics for the poster. He has manual AC.
Most llkely as mentioned the Blower Motor Relay is bad.
If you pull the relay, use an ohm meter and on the relay measure from pin C to Pin E.
Should be zero ohms.
*******After looking at Agent 86's schematic, you should have zero ohms from pin B to E and not C to E.
***********
Last edited by Hooked on Vettes; Sep 15, 2006 at 11:00 AM.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Originally Posted by Hooked on Vettes
Agent 86 you need to post the C60 Blower schematics for the poster. He has manual AC.
Most llkely as mentioned the Blower Motor Relay is bad.
If you pull the relay, use an ohm meter and on the relay measure from pin C to Pin E.
Should be zero ohms.
http://members.shaw.ca/dankai/Air%20...0%20Manual.pdf
Thread Starter
Banned Scam/Spammer
Joined: Jun 2006
Posts: 364
Likes: 3
From: Monroe Washington
Called the local NAPA store and they said they could have a new relay by 1:00 pm today. So I decided to go check to see if I could bypass the relay and get the blower to work. Sure enough I did. Then I took the relay and did a little file job on the contacts and low and behold, fan now works in all positions. Saved myself $11.00.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Thread Starter
Banned Scam/Spammer
Joined: Jun 2006
Posts: 364
Likes: 3
From: Monroe Washington
What I did was pull the cover off the relay then turn on the blower at the lower speed. Initially got nothing so I took a knife and pushed down on the contact bar, fan started. Pulled the relay out and could not find a file so I grabbed and pair of nail clippers with the small file, ran the file over the contacts a couple times and presto, fan works on all settings now. Sorry, Guinness cost more so I could only get three.