PeachParts Mercedes-Benz Forum - View Single Post - How cold is too cold for AC if there is such a thing

bigblockchev · #5 07-27-2009, 10:19 PM

We generally don't get temps much higher than 85 or so which is what it was when testing, also humidity is not too high either. I was more concerned with the refrigeration portion of the system getting damaged. If the evap froze up it would have to get moisture from somewhere. Lowrider the driver side connector on the top of push button unit, the one marked with a red band has 12 pins on it. In my vehicle a 190D pin 6 needs to have a ground signal on it to tell the Kilma to turn the compressor on , the wire is blue with a green stripe. I am not sure if all the vehicles have the same color code or pin position so you may have to do some investigating. I just used a jumper lead connected to ground to verify the pin started the compressor. In my vehicle the Pushbutton unit is electronicly protected from shorting unlike earlier units. Yours may be different. Cheers Dan