am looking for a klima relay(AC control relay) for my 1991 SDL. Any lead will be appreciated.
Welcome to the forum.
It is organized according to your cars chassis, the W126
(just scroll back). I have copied your post there. One of the top stickies is WTB/FS = for sale/ wanted to buy etc. There is also a forum wide FS/WTB.
I am not an expert on 91 350SDL, but I guess the relay of any 91 W126 whether gas or diesel should do, likely even any late model 89-91?
Please make sure to read the 'New members, please read....' on top of the W126 to navigate the forum archive and more.
Your old relay should have a Mercedes parts number. To be clear the AC relay under the hood will say 'Klima,' so I assume you are not asking for the dash center console automatic climate control.
The forum has a wealth of information available via forum search. For frequently asked questions check archives first, otherwise, just post and someone will chime in.