Heater fan switch
Thread Starter
Instructor
Joined: Dec 2000
Posts: 178
Likes: 0
From: Twin Lake MI
Heater fan switch
Need to get cooling system functioning properly and my blower only
runs on HIGH speed. Is my problem with the switch or is it in
fan motor? Is there a resistor block located in concel? Steve
runs on HIGH speed. Is my problem with the switch or is it in
fan motor? Is there a resistor block located in concel? Steve
Burning Brakes
Joined: Jan 2000
Posts: 792
Likes: 1
From: Fairbanks Alaska
Re: Heater fan switch (s79vette)
Check the plug that goes to your blower motor. It's on the passenger side corner at the firewall, right on top. When mine was unplugged it only worked on High also. Good luck.
John
John
Melting Slicks
Joined: Oct 2000
Posts: 2,143
Likes: 195
From: Englewood FL
Re: Heater fan switch (s79vette)
Mounted on the firewall near the heater resister is the high blower relay.
When it fails the fan will either only work on high speed or the lower three
speeds. Suspect this is your problem. The relays are readily available
at many parts stores.
When it fails the fan will either only work on high speed or the lower three
speeds. Suspect this is your problem. The relays are readily available
at many parts stores.
Thread Starter
Instructor
Joined: Dec 2000
Posts: 178
Likes: 0
From: Twin Lake MI
Re: Heater fan switch (mark79,80)
Hey Mark,
I worked on it Friday nite after reading about what to look for.
The first thing I did was pull plugs off relay and check voltage.
It's a 5 wire plug and one is 12 vts. Jumped from it to another
wire until fan ran. It then ran on 3 speeds but not high. I
figured it was the culprit. I'll pick one up asap. Found it in
Ecklers for 13 bucks, will try local shops. Steve
I worked on it Friday nite after reading about what to look for.
The first thing I did was pull plugs off relay and check voltage.
It's a 5 wire plug and one is 12 vts. Jumped from it to another
wire until fan ran. It then ran on 3 speeds but not high. I
figured it was the culprit. I'll pick one up asap. Found it in
Ecklers for 13 bucks, will try local shops. Steve
