1973 Heater thumb wheel
05-19-2017, 11:26 AM
#1
Advanced
Thread Starter
1973 Heater thumb wheel
Took my girl out in the '73 lastnight for dinner, T tops off, got a bit chilly on the way home. I turned on the heat, no problem until I went to roll the thumb wheel up on the heat side to shut everything off. I can't get the orange needle (indicator) to go completely up to the top to Cold. It is driving me crazy that I am in my office at work today and can't be home figuring out what happened with the thumb wheel control. When I take it apart this weekend, should I see something obvious that has happenend?
05-19-2017, 12:30 PM
#2
Safety Car
thumbweel is connected directly to the cable control, which is connected to the temperature mix door. maybe something fell into the defroster, now blocking the mix door from moving.
05-19-2017, 12:39 PM
#3
Advanced
Thread Starter
Allright, can't wait to get home and take it apart and see what happened in there..(probably tomorrow morning, though).
05-19-2017, 02:53 PM
#4
Former Vendor
Member Since: Aug 2006
Location: Jeffersonville Indiana 812-288-7103
Posts: 76,656
Received 1,813 Likes
on
1,458 Posts
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Does the wheel feel as if it's going all the way forward.... both wheels turn the same amount of turns so check the one that is working and see how many rotations it takes, then compare to the one that isn't.
If it's not traveling the full throw, then something is stuck inside either blocking the door or it's a cable issue. The issue quite possibly may be the tang on the needle broke and it's slipped on the string, the wheel itself or the drive shaft inside the housing.
If you go to this page you'll see what I'm talking about. Click on supporting document when you get there.
1968-1976 Corvette Heater Control Rebuild
If it's not traveling the full throw, then something is stuck inside either blocking the door or it's a cable issue. The issue quite possibly may be the tang on the needle broke and it's slipped on the string, the wheel itself or the drive shaft inside the housing.
If you go to this page you'll see what I'm talking about. Click on supporting document when you get there.
1968-1976 Corvette Heater Control Rebuild
Last edited by Willcox Corvette; 05-19-2017 at 02:55 PM.
05-19-2017, 03:28 PM
#5
Advanced
Thread Starter
Does the wheel feel as if it's going all the way forward.... both wheels turn the same amount of turns so check the one that is working and see how many rotations it takes, then compare to the one that isn't.
If it's not traveling the full throw, then something is stuck inside either blocking the door or it's a cable issue. The issue quite possibly may be the tang on the needle broke and it's slipped on the string, the wheel itself or the drive shaft inside the housing.
If you go to this page you'll see what I'm talking about. Click on supporting document when you get there.
1968-1976 Corvette Heater Control Rebuild
If it's not traveling the full throw, then something is stuck inside either blocking the door or it's a cable issue. The issue quite possibly may be the tang on the needle broke and it's slipped on the string, the wheel itself or the drive shaft inside the housing.
If you go to this page you'll see what I'm talking about. Click on supporting document when you get there.
1968-1976 Corvette Heater Control Rebuild
05-19-2017, 03:32 PM
#6
Advanced
Thread Starter
No, it's almost like it's hung up on something and almost feels "off track" or something. It does NOT roll smoothly at all. And this happened all of a sudden, has been working fine. Need to just get in there and see what's going on. I will check that link you supplied, thank you.
05-20-2017, 11:21 AM
#8
Former Vendor
Member Since: Aug 2006
Location: Jeffersonville Indiana 812-288-7103
Posts: 76,656
Received 1,813 Likes
on
1,458 Posts
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
No, it's almost like it's hung up on something and almost feels "off track" or something. It does NOT roll smoothly at all. And this happened all of a sudden, has been working fine. Need to just get in there and see what's going on. I will check that link you supplied, thank you.
Willcox
05-21-2017, 11:26 AM
#9
Advanced
Thread Starter
So I fixed it, basically the string came off the pulley. Grabbed the spring with needle nose pliers and shoved the pulley over and snapped the string back onto it. Crazy how the whole mechanism works. Love this forum and all the help it provides. Thanks again. Gotta go , sun is shining here in the Pacific Northwest...FINALLY.
05-21-2017, 01:56 PM
#10
Advanced
Thread Starter
So I fixed it, basically the string came off the pulley. Grabbed the spring with needle nose pliers and shoved the pulley over and snapped the string back onto it. Crazy how the whole mechanism works. Love this forum and all the help it provides. Thanks again. Gotta go , sun is shining here in the Pacific Northwest...FINALLY.
05-23-2017, 12:42 PM
#11
Former Vendor
Member Since: Aug 2006
Location: Jeffersonville Indiana 812-288-7103
Posts: 76,656
Received 1,813 Likes
on
1,458 Posts
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
Last edited by Willcox Corvette; 05-23-2017 at 12:42 PM.