First, check for voltage at the low pressure switch on the reciever/ dryer. This is the one with spade lugs and push-on connectors. If you have voltage (12V or more) to ground, the pushbutton unit is not switching the compressor on. Jumper them together with the engine running and the ACC on -- if the compressor runs, either it's already low on charge or the switch is bad. If there is no voltage and it doesn't run jumpered, time to check ou the KLIMA relay, it's not switching on.
You should also watch the compressor when first starting the ACC up -- if the compressor runs a few seconds and kicks out, you are not getting a good speed signal from the compressor to the KLIMA relay, and it will shut of the compressor until you do a power cycle. This can be quite annoying. Finally, you need to jumper the #5 and #7 (I think, will check tonight) sockets in the KLIMA relay socket with a large wire -- this directly engages the compressor. If it then runs and cools properly, you have a problem with the KLIMA relay. There are a series of checks there, but no need to get all exited unless the compressor ground signal is good and you don't have engagement. Also check the fuse -- a bad clutch coil will blow the climate control fuse. Peter _______________________________________ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
