On my 83 the Left heater knob spins very easily, It has no resistince like it did have and the heat is always on now.The right side one is okay you all know what I mean because The cold setting is when the arrow is points down and the cold is up , 180 Degree turn . Is this something that can be fixed or replaced?

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A couple of Ford pickups F 150,250, 350 missed.
1983 240 D 256,000 miles ,auto, ac.

This could be either a broken knob or a broken control valve. Pull both knobs off and compare the stubs sticking out of the control panel.

Actually, try the right knob on the left control and see what you get.

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Rick Miley
2014 Tesla Model S
2018 Tesla Model 3
2017 Nissan LEAF
Former MB: 99 E300, 86 190E 2.3, 87 300E, 80 240D, 82 204D Euro
Chain Elongation References

If I remember right from what I saw when I had the dash outa my 240D, there is a cable going from each knob to the double valve on the engine side of the fire wall. No vacuum to screw up anyway.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

Thanks , I will check under the hood first, I also have to take the plastic panel apart because the liitle bulb that is in the heater knob has a broken electric socket and the wire got pulled thru the backside of this panel , so I will have to get behind thre also.

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A couple of Ford pickups F 150,250, 350 missed.
1983 240 D 256,000 miles ,auto, ac.