Here is a picture of the climate control in my 1981 240D. When I look up the part on this and other websites it shows the control basically being the same as the ones in my 300D's.

This would probably help,huh?

IN the USA that is a 240D system only! Not A/C/C but a manual system.

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MERCEDES Benz Master Guild Technician (6 TIMES)
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Retired Moderator

Don't get rid of that system. People out here are buying 240Ds and stuffing 300D turbos in them to get away from climate control.

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Auto Zentral Ltd.

So far I have been going through miles of threads trying to figure this system out. No manuals with the car. Haven't been able to get fan going yet to see if heat works, but I haven't really gotten under the hood much on this one. Fuses in box are all good but I'm sure there's more around that can be bad. Thought about putting in the motor,tranny,exhaust out of one of my 300D's but the turbo's seem to alot more maintenance.

here ya go:

http://mercedes.braingears.com/

You will find the owner's manual here as well as the factory manuals. That goes for your 300Ds and your W126 gasser , too. I have a little trouble getting air to the right place on the '82 240D, but its miles ahead of the 300D we have in simplicity.

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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)