I think you’ve got it - Mercedes-Benz W124 HVAC Resistor Replacement | 1986-1995 E-Class | Pelican Parts DIY Maintenance Article

Your engine will start and run fine without the ALDA. You might see more smoke when you go heavy on the pedal and shifts might be harsh but it won’t matter if you’re just testing the AC.

Sixto
98 E320s sedan and wagon