W115, Rust Repair

1976 300D Wont change from A/C to heater

I am about to fix a 1976 300D that does not change over to heat when you turn the A/C off. We bought it from a dealer and know very little of the car's maintenance/repair history. I can tell that the car was well maintained and runs/drives great. The heater slide controls are working, but whatever is supposed to happen when you turn the A/C knob fully counter clockwise is not functioning. I was wondering if anybody knew of a common problem that I should look for when I repairing this.

Chassis Model Number

W115

Forums

Body and Interior Specific Aid

Sporadic smoking,electrical additions & injector leaking

Hi,

I have a '76 240D with an Elsbett conversion kit. Installed right before mercedessource came out with their own kit. Installed the auxillary fuel pump & works great. Also installed an injector line heater wrap. I wish I had gone with the heater Ken offers, didn't know he had it. Another regret, I had someone else install the Auxillary pump and injector wraps and although they work fine, they didn't do as good as a job as I would have, if I had the time to do the work myself. Now I have an Elsbett heat wrap around the the filter, injector line heat wrap and the auxillary pump all pulling juice, works fine but the wiring is getting messy. So three things I'd like to change/correct:

Chassis Model Number

W115

Forums

SVO Fuel Conversion Specific Aid

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