Heater control problems
Thread Starter
Cruising
Joined: Sep 2005
Posts: 11
Likes: 0
Heater control problems
Hi folks,
I was hoping to tap into the wealth of experience on these boards.
1979 Corvette....here's the problem:
The heater and air controls in the dash do not work. THe fan blows at the selected levels, but it will only blow through the floor vents and I can't get it to change to defrost, vent, etc. No matter what is selected, it blows out of the floor.
Any thoughts?
Thanks for the help!
I was hoping to tap into the wealth of experience on these boards.
1979 Corvette....here's the problem:
The heater and air controls in the dash do not work. THe fan blows at the selected levels, but it will only blow through the floor vents and I can't get it to change to defrost, vent, etc. No matter what is selected, it blows out of the floor.
Any thoughts?
Thanks for the help!
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
There is a vacuum distribution valve on the control under the console. Most of the time the plastic rivet has broken on it causing the symptoms you describe. You can replace the rivet with a pop rivet or a nylon screw of the proper size. This restores the pressure on the valve halfs and it will work again. Be careful not to get it too tight though.
Burning Brakes
Joined: Jun 2005
Posts: 764
Likes: 2
From: THE OLDER I GET THE BETTER I WAS! NORTHERN ONTARIO
Originally Posted by wombvette
There is a vacuum distribution valve on the control under the console. Most of the time the plastic rivet has broken on it causing the symptoms you describe. You can replace the rivet with a pop rivet or a nylon screw of the proper size. This restores the pressure on the valve halfs and it will work again. Be careful not to get it too tight though.
Melting Slicks
Joined: Oct 2005
Posts: 2,526
Likes: 99
From: Apache Junction, Arizona
St. Jude Donor '12-'13-'14-'15-'16
Heater
Originally Posted by wombvette
There is a vacuum distribution valve on the control under the console. Most of the time the plastic rivet has broken on it causing the symptoms you describe. You can replace the rivet with a pop rivet or a nylon screw of the proper size. This restores the pressure on the valve halfs and it will work again. Be careful not to get it too tight though.
My worst fear is that mice got into the car and had a wirefest!
Instructor
Joined: Sep 2005
Posts: 126
Likes: 0
From: Delavan Illinois
I did as Wombvette suggested, and that was the situation in my case. Made the repair and controls work fine. Many thanks!
As mentioned in other posts, the blower fan output is really pitiful.
Another question......does the fan run all the time? I thought the lowest setting would be "off", but the fan still runs. I mean, the fan increases with each switch position, just doesn't shut off on lowest.
Thanks again. One more little problem solved!
Jim
As mentioned in other posts, the blower fan output is really pitiful.
Another question......does the fan run all the time? I thought the lowest setting would be "off", but the fan still runs. I mean, the fan increases with each switch position, just doesn't shut off on lowest.
Thanks again. One more little problem solved!
Jim
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Burning Brakes
Joined: Sep 2005
Posts: 1,078
Likes: 0
From: Santee CA
Originally Posted by Ifailedjimclass
I did as Wombvette suggested, and that was the situation in my case. Made the repair and controls work fine. Many thanks!
As mentioned in other posts, the blower fan output is really pitiful.
Another question......does the fan run all the time? I thought the lowest setting would be "off", but the fan still runs. I mean, the fan increases with each switch position, just doesn't shut off on lowest.
Thanks again. One more little problem solved!
Jim
As mentioned in other posts, the blower fan output is really pitiful.
Another question......does the fan run all the time? I thought the lowest setting would be "off", but the fan still runs. I mean, the fan increases with each switch position, just doesn't shut off on lowest.
Thanks again. One more little problem solved!
Jim
When I get my C3 on Sunday, I'll try to locate the blower motor and see if I can find a direct replacement for the blower motor on it that will bolt right in, since the Dayton motors are a little bit bigger in diameter.
Burning Brakes
Joined: Jun 2005
Posts: 764
Likes: 2
From: THE OLDER I GET THE BETTER I WAS! NORTHERN ONTARIO
[QUOTE does the fan run all the time? I thought the lowest setting would be "off", but the fan still runs. I mean, the fan increases with each switch position, just doesn't shut off on lowest.
Yup That is GM's way of clearing the drivers compartment of noxious fumes!
Yeah! so yes it is normal. Don't quote me but I think the removal of the brown wire at the heater box connections quits the fan in the lowest position.
Yup That is GM's way of clearing the drivers compartment of noxious fumes!
Yeah! so yes it is normal. Don't quote me but I think the removal of the brown wire at the heater box connections quits the fan in the lowest position.
Instructor
Joined: Dec 2000
Posts: 178
Likes: 0
From: Twin Lake MI
fan running
If you turn control to off the fan will stop, mine does and it's a 79. As
far as C4 blower motors. It ain't the motor thats changed but the squirrel cage fan. A shim has to be made because of length. There have
been posts over the years regarding this upgrade. Steve
far as C4 blower motors. It ain't the motor thats changed but the squirrel cage fan. A shim has to be made because of length. There have
been posts over the years regarding this upgrade. Steve
