Marshall, I thought that's how it should work. My 124 diesel will fluctuate between 38-42F when it's rolling along at speed, even on a really hot day. And I don't have the Easley mod. I read what you sent about that but I think what he did was a Band-Aid for another problem. I do NOT believe Mercedes intended the stock setting to be 48-52F, which is what he was getting on his test car, then he added the resistor shunt to drop those temps into the mid/upper 30's. I believe it should be 38-42F and maybe his shunt trick could drop that to maybe 36-40 or 34-36, depending on how close you want to run to the freezing point.
I'll have to yank the sensor and test it, maybe tomorrow night. I hope you are correct that they drift up over time. I can yank the one from the parts car for comparison. :-) Dave M. > ------------------------------ > Date: Tue, 09 Aug 2005 18:44:37 -0400 > From: Marshall Booth <[EMAIL PROTECTED]> > Subject: Re: [MBZ] W124 A/C question - compressor cuts off too soon? > > The evaporator sensor circuit starts off with a cutoff point of about 5 > deg C (that's ~41 F when the sensor is about 25k ohms) and the sensor > USUALLY slowly edges upwards in resistance as it ages. On 124s > manufactured after 9/87 also shut off the compressor if the sensor > shorts - resistance drops below 2.5k ohm. Richard Easley calculated a > modification to drop the the effective cutoff to about 36-38 F (with a > new sensor). > > I'll see if I can find Richard's modification, but it was on his Baylor > pages and I'm not sure they still exist in their former form since he > left the RE list.. > > Marshall
