W123

1985 300TD Ignition Switch Replacement Error?

I recently had my shop replace the ignition switch. Now the heater does not go off after the key is removed. I can't recall if this was the how it worked before, but it doesn't seem right. Before I return to the shop, I'd like to confirm this. Also, what can they possibly have done to make this happen? My understanding is that the wiring just plugs into the back of the switch. There doesn't seem much room for error.

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1985 300TD - Mysterious Intermittent Starting Problem

9 times out of 10 my car starts immediately no problem. 1 time out of 10 there is a click and then nothing. After several attempts I can get the car started and then everything is OK for a couple more days...

Here's the mystery. I had my shop check the solenoid (OK) and replace the ignition switch using the kit sold on this site. Everything was fine for a couple of days, then the same problem occurred. We can almost live with the problem but I'm concerned that one day we won't be able to start it at all.

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