Reset Error codes in Climate Control
 

Anybody got an info on how you reset the error codes on the climate control (dashboard) box on a 1992 300SD (W140)? I imagine it's likely to be similar on most models with CC of that vintage.

Also, where is the "coolant pump?" I have a Mitchell CD on the thing and it says it is by the steering box, but I'll be darned if I can see it. It also says the relay for same (coolant pump) is in the fuse box—well, there ain't no relay in my fusebox!

This is all about my fan not working. Fan is OK and am trying to trace back what's wrong. I have error codes 74 and 75 which seem to be related to the coolant pump.

Thanks for any help.