Hello,

I have a '76 300D (W115 chassis) that needed a speedometer oiling and a odometer fix. Did this with no problem, but then I reinstalled the cluster and found that:

• The blowers for both A/C and heat are inoperative.
• The A/C compressor does not engage when I switch the blower on and turn the temperature knob all the way clockwise.
• The A/C and heater both worked well before this, and all the climate controls were functional.

I also was doing other work in my engine bay too, so perhaps it was something in the fire wall, but I doubt it. I pulled both of the panels under the steering column for this job, so I could have hit something under there, too.

Any tips on this before I get started, to save time? I feel like I could spend hours trying to diagnose this issue.

Thank you for the help !
Henry C.