Hi all,
I just purchased a rebuilt climate control unit (switch unit) for my '85 W123 - the previous one nearly caught on fire sometime in the past due to the aux water pump seizing. I've replaced the water pump and my mono-valve tests OK.

One of the pre-installation tests involved checking resistance across the right side switch connector from pin 3 to pin 6, looking for > 35 (or 55 depending on which test document I look at) ohms. This is supposed to be testing the AC clutch relay. I'm getting zero continuity across those two pins. I am aware that infinite resistance is greater than 35 ohms, but I just want to double check. Is this acceptable?

Currently my system is discharged, waiting for me to finish installing the new controller and replace a few more things on the refrigerant circuit before I charge the system.

I do have an email in to tech support for the remanufacturing company, but I've got no idea when they will respond.

Thanks!