A friend's 1995 E320 is getting a bit hot during summer when A/C is on and idling. I read this post:
'93 w124 M104 Aux fan ground location.
I am thinking it may be the resistor because it does now seem to have a low speed. If I recall correctly (from my 1987 300TDT), when A/C is engaged the Axillary fans turn on low. When Temps reach 105, it goes to medium, and then at 120 is run at full.
I have been reading that it is only 2 speed, low and high. Either way, it appears to turn onto High at 105 and does nothing when A/C is turned on.
Should the fan be engaging on low when the A/C is on?