White500SL

Hi All: looking for help. The compressor does not engage on my 1992 R129.
From everything I have read is appears to be an compressor speed senor issue. The clutch will engage with direct power. The Freon levels are good. I have found how to check for codes in the climate control unit and it read 01 (no codes) but cleared it anyhow.
I did have a power steering leak, which my have caused belt slippage.
Many things say to find the klima relay, I have no idea where that is. Can anyone point me to it? and is there a way to do a reset of the compressor speed sensor?

thanks for your help

bobterry99

The actual or approximate location of the MAS module is shown in the attachment.

The MAS was recently discussed extensively here. That thread has links to means for reading codes from the MAS and a code book.