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poopdevil Samba Member
Joined: September 03, 2008 Posts: 270 Location: Seattle
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Posted: Thu Jul 14, 2016 8:27 pm Post subject: Heater knob problems... |
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Anyone know exactly what goes on when you turn the heater knob?
I recently reconnected my heater flaps to the cables. I replaced the pin in the handle and started turning it..If I didn't also turn the threaded piece under the handle the handle would want to resist my turning...I was able to get the flaps to raise but then today when I lowered them and tried again ...it was popping and then went real loose..I twisted the metal threaded piece until I pulled the unit out and behold the cable was snapped..
What is happening inside the tube holding the cables while turning...I need to figure this out so I can fix it properly..Is there a diagram out there?
I replaced my heater boxes and flaps so its all new.
It cant be that hard and I don't understand why it snapped while turning it..the cables are not rusty or anything but had a lot of resistance.
thanks in advance |
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RareAir Samba Member
Joined: May 11, 2002 Posts: 14577 Location: 18 miles North of the border
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Posted: Thu Jul 14, 2016 8:56 pm Post subject: Re: Heater knob problems... |
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The heater control assembly acts like a turn buckle. There is an outer sleeve, inside resides a threaded insert. The threaded insert travels up/down inside the sleeve depending on direction of rotation of the control knob.
When you twist the knob to close the flaps (heater on), the threaded turn buckle pulls the cables tight. This will effectively shorten the length of the cable, pulling the flaps closed and forcing the heat from around the cylinders into the cabin.
Twisting the knob to open the flaps (heater off) will allow the cable to slacken and sit in its 'rest' position.
When you installed the cable, are you aware that one side of the cable is longer than the other? Be sure to put the cable lengths inside their proper holes _________________ 1947 Typ 11a
1954 Typ 117
1956 Typ 151
1959 Typ 117
1959 Typ 265
1961 356B
1966 Typ 151
1966 Typ 241 |
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poopdevil Samba Member
Joined: September 03, 2008 Posts: 270 Location: Seattle
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Posted: Thu Jul 14, 2016 9:04 pm Post subject: Re: Heater knob problems... |
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Cables were already installed so I didn't know one was shorter. Why would it have snapped do you think? Is there a diagram out there? When turning does the cable wrap around the sleeve as you turn it? |
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EVfun Samba Member
Joined: April 01, 2012 Posts: 5481 Location: Seattle
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Posted: Fri Jul 15, 2016 5:08 am Post subject: Re: Heater knob problems... |
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poopdevil wrote: |
Cables were already installed so I didn't know one was shorter. Why would it have snapped do you think? Is there a diagram out there? When turning does the cable wrap around the sleeve as you turn it? |
The cable doesn't wrap around the sleeve. The sleeve should move up and down as you turn the knob. This will in turn pull the cables up and down. The knob has a coarse thread screw in the end of it. The sleeve threads onto that. A pin keeps the sleeve from rotating in the hole. _________________
Wildthings wrote: |
As a general rule, cheap parts are the most expensive parts you can buy. |
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Fri Jul 15, 2016 7:47 am Post subject: Re: Heater knob problems... |
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Here's a page from the service manual showing the pieces if it helps any.
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poopdevil Samba Member
Joined: September 03, 2008 Posts: 270 Location: Seattle
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Posted: Fri Jul 15, 2016 9:55 am Post subject: Re: Heater knob problems... |
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Ahhh. Thanks so much...I am wondering what snapped the cable..literally both sides broke and left a tine U shaped bit left attached to the unit..
Thanks for the Diagram. I am going to take it all apart and clean it and re grease and add new cables and see what happens. |
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jason Samba Member
Joined: August 07, 2002 Posts: 3444 Location: Garage
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Posted: Tue Jul 19, 2016 5:56 pm Post subject: Re: Heater knob problems... |
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Make sure it turns really easy while apart. If it is tight it will twist the cable instead of pulling. |
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poopdevil Samba Member
Joined: September 03, 2008 Posts: 270 Location: Seattle
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Posted: Tue Jul 19, 2016 8:41 pm Post subject: Re: Heater knob problems... |
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That's the problem I think. I took it out and will be messing with it soon. Pretty sure the inner screw is jammed and the whole unit was turning. |
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Snort Samba Member
Joined: April 02, 2005 Posts: 1957 Location: Seattle, WA
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Posted: Wed Jul 20, 2016 6:22 am Post subject: Re: Heater knob problems... |
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I remember another person having this problem a few years back. In that case the locating pin inside the tunnel was broken off allowing the #5 in the drawing to spin. |
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