Quote:
Originally Posted by naidd
Does the original Cool Harness have the same problem as the V2 -- keeping the fans on HIGH once they are on? Is this a consistent problem with Cool Harness users or an isolated incident?
I am interested in applying both changes to my '89 190E 2.6 which has a dead A/C (leaky evap).
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The hysterisis for the Aux Fan ckt is around 5 degs C; so if it goes on at 100C it should go off at 95C. Those MBs with multiple fan speeds have a slightly larger hysterisis value (on=115C; off=107C) at higher engine temps. All of this info is in MENU#18 in the "Aux Fans Activation".
If your car has dead A/C then it shouldn't get to 100+C; suggest that you follow the steps in MENU#17 in the "agua" colored table. The 5 steps should lower the engine temp so that the fans won't run all the time.
My car with A/C in 95F w/ 80% RH, doesn't go above 95C. On the highway, it's under 90C. So the A/F are off.
If the A/Fs don't go off, it's b/c the engine temp doesn't lower when the fans turn on, indicating something isn't right. The Cool Harness doesn't KEEP them on, your engine temperature does!
Also the original Cool Harness comes in three (3) ranges as shown on the CH table. I use the CH-92 but many prefer the CH-95 and/or CH-98. The numbers represent the trigger point for A/F cutin.