1979 heater fan
Advanced
Joined: Mar 2008
Posts: 70
Likes: 1
From: Louisville Kentucky
go to the passanger side of the vette look inside the fendor and you will see you blower motor ... just on the other side of your heater core should be where your power wire plugs in if its not hooked up then you know it just does not have power.. if it is then you may want to remove it and put power to it to see if it spins if it doesnt id replace it.
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,853
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I think before I would tamper with anything I would confirm the motor works. You can do this by running 12v. to the plug. Just run the 12v. first and then if the motor works proceed to look for other items.
If the motor fails to run, install a verified ground to the motor and apply the 12 volts again.
If the motor then fails to run you know you have a bad motor. If the motor runs I would test the resistor, make sure the blower relay is plugged in and if all else fails trouble shoot the heater control assembly.
The blower motor is controlled by the heater control switch in the shifter console, the resistor and the relay. Anyone of these could cause a failure in the motor function.
There are other things you can check but this may give you a good start.
Willcox Inc.
If the motor fails to run, install a verified ground to the motor and apply the 12 volts again.
If the motor then fails to run you know you have a bad motor. If the motor runs I would test the resistor, make sure the blower relay is plugged in and if all else fails trouble shoot the heater control assembly.
The blower motor is controlled by the heater control switch in the shifter console, the resistor and the relay. Anyone of these could cause a failure in the motor function.
There are other things you can check but this may give you a good start.
Willcox Inc.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
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
C3 Corvette Enthusiast
Joined: May 2008
Posts: 1,071
Likes: 3
A longtime C4 owner now straying into C3 territory...
I now own a 1979 Coupe with heating and AC.
My blower control switch is as finicky as some of my ex-girlfriends. The blower works if the swtich is jiggled around, then stops once any pressure is taken off the switch. I have no desire to spend 150 bucks for the heater control module if there is a way to repair the blower switch.
Has anybody attempted this fix? If so, is it easily doable or do you have to have the patience of a rock to work on the thing?
I'm going into the dash to replace the antiquated sound system next week and the blower switch is going to be my "must do" thing.
Any info/directions/advice will be greatly appreciated.
I now own a 1979 Coupe with heating and AC.
My blower control switch is as finicky as some of my ex-girlfriends. The blower works if the swtich is jiggled around, then stops once any pressure is taken off the switch. I have no desire to spend 150 bucks for the heater control module if there is a way to repair the blower switch.
Has anybody attempted this fix? If so, is it easily doable or do you have to have the patience of a rock to work on the thing?
I'm going into the dash to replace the antiquated sound system next week and the blower switch is going to be my "must do" thing.
Any info/directions/advice will be greatly appreciated.
Le Mans Master
Joined: Jul 2009
Posts: 6,647
Likes: 1
From: East Aurora N.Y.
St. Jude Donor '10
A longtime C4 owner now straying into C3 territory...
I now own a 1979 Coupe with heating and AC.
My blower control switch is as finicky as some of my ex-girlfriends. The blower works if the swtich is jiggled around, then stops once any pressure is taken off the switch. I have no desire to spend 150 bucks for the heater control module if there is a way to repair the blower switch.
Has anybody attempted this fix? If so, is it easily doable or do you have to have the patience of a rock to work on the thing?
I'm going into the dash to replace the antiquated sound system next week and the blower switch is going to be my "must do" thing.
Any info/directions/advice will be greatly appreciated.
I now own a 1979 Coupe with heating and AC.
My blower control switch is as finicky as some of my ex-girlfriends. The blower works if the swtich is jiggled around, then stops once any pressure is taken off the switch. I have no desire to spend 150 bucks for the heater control module if there is a way to repair the blower switch.
Has anybody attempted this fix? If so, is it easily doable or do you have to have the patience of a rock to work on the thing?
I'm going into the dash to replace the antiquated sound system next week and the blower switch is going to be my "must do" thing.
Any info/directions/advice will be greatly appreciated.
C3 Corvette Enthusiast
Joined: May 2008
Posts: 1,071
Likes: 3
And I found the switch in a Corvette Central book. I'm ordering one now.
Thanks.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
I changed low to off a long time ago.
Blower A/C Vent
Low to Off
There is a 4 wire T connector at resistor connection on A/C evap. box under hood on pass. side forward of the high blower relay & hood spring. Pull connector & bend down the connector to dk. brown wire & reconnect.
Forward speed will push air through the system even w/ blower off.
If someone is running the A/C on low then leave low connected.
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
There is also a fuse in the interior fuse box.
There are 2 fuses & low bypasses the switch so if it doesn't run in any speed, check the blower as it could be wore out from running full time.
I think before I would tamper with anything I would confirm the motor works. You can do this by running 12v. to the plug. Just run the 12v. first and then if the motor works proceed to look for other items.
If the motor fails to run, install a verified ground to the motor and apply the 12 volts again.
...
Willcox Inc.
If the motor fails to run, install a verified ground to the motor and apply the 12 volts again.
...
Willcox Inc.
6th Gear
Joined: Jun 2011
Posts: 6
Likes: 8
From: Glenwood Maryland
I realize this is an old thread, but I had the same issue as American Raven. I ordered a new switch and it didn't fix the problem. This is one of those "DUH!" moments. I had the top lever in the "OFF" position, but didn't realize it because OFF is hidden by the lever when you are looking at the console from the driver's position. I just thought I would add that information because it probably falls in the category of "Make sure it's plugged in" or "Does it have power".
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
