a/c compressor to work on 24v

[bimmer630]

Don't forget to hook up the hot A/C lead (a black 2 wire connector in/behind the center dash that is wrapped in gray factory tape). Look for it and use the blk/red wire and pin it out to 64 on the DME to get the car to idle up when you energize the A/C. Otherwise, it will idle-cycle (up and down) because the DME will not know to raise the idle for a load.

Did this today and now the idle is steady A/C or not. Before today, when coming to a stop with the A/C on, the car would idle cycle from 500-900rpm constantly. Now the idle is cream smooth @ 8-900 rpm with A/C. No fluctuation.

Hope this helps.

Ed

Im doing this now to mine, and are you SURE the black and red wire is the one to use? The schematic shows that wire as a signal from the AC pressure switch... Not the snowflake button signal. I connected the black/red to DME pin 65 and it made the CEL come on and it all acted funny. I think theres something with the pressure switches on e36 providing a ground and the switches on E30 providing a power or vice versa. I removed that pin 65 connection and just connected the black and violet wire from the snowflake button to pin 64 and it seems to be working OK

[bimmer630]

Don't forget to hook up the hot A/C lead (a black 2 wire connector in/behind the center dash that is wrapped in gray factory tape). Look for it and use the blk/red wire and pin it out to 64 on the DME to get the car to idle up when you energize the A/C. Otherwise, it will idle-cycle (up and down) because the DME will not know to raise the idle for a load.

Did this today and now the idle is steady A/C or not. Before today, when coming to a stop with the A/C on, the car would idle cycle from 500-900rpm constantly. Now the idle is cream smooth @ 8-900 rpm with A/C. No fluctuation.

Hope this helps.

Ed

Im doing this now to mine, and are you SURE the black and red wire is the one to use? The schematic shows that wire as a signal from the AC pressure switch... Not the snowflake button signal. I connected the black/red to DME pin 65 and it made the CEL come on and it all acted funny. I think theres something with the pressure switches on e36 providing a ground and the switches on E30 providing a power or vice versa. I removed that pin 65 connection and just connected the black and violet wire from the snowflake button to pin 64 and it seems to be working OK