1994 E420, 235K miles 8/2011, Original Owner, I do all of my own repairs, goal: how far can it go?
The a/c hasn't been cooling as it should after running for a while on a hot day. I hooked up the gauges to add some refrigerant. I noticed the aux fans were running intermittently. I unplugged the coolant sensor (on the top front of the engine) and the fans ran. Each time I would try to plug it back into the sensor, the fans would stop. I assume this means the sensor is bad and needs to be replaced? I think the part number is 0085-424-517