As you will note from the previous threads, I have been plagued with overheating on my 1995 E320. Thanks to all that responded, I was able to trouble shoot the system, and found a number of problems. The first one that was the most difficult to unravel was that the low speed and high speed relays had been reversed. This may have occured about a year ago when I had the car worked on because the alarm system had immobilized the car, and the mechanic did some wiring changes to bypass the alarm interlock.

Secondly, I apparently had a bad temperature sensor. Not very expensive to replace (about $40).

Lastly, when the above two items were corrected, only ONE of the auxxilliary fans came on! So, I apparently had burned up one of the fans sometime in the past.

Incidentally, unless there is some secret to replacing the aux fans on the 124 chassis.............it's a many step job! Even though the aux fans sit in front of the radiator........you cannot remove them from the front. Instead, you have to remove both the radiator and the A/C condenser.........and the fans then pull out from the rear. This is some terrible German engineering. I had to drain the radiator and depressure the A/C system to get the fans out.

At any rate, the deed is done and the car is running nicely now.

One question for the BB, though. Sometime ago, I recall a poster offering a custom plug with a resistor built in that reduces the trigger temperature for the aux fans from 107 degrees..........down to about 95 degrees. But, I can 't find the information from the archives. Would appreciate any info that would allow me to either fabricate the plug or purchase one. I get a little nervous when the temp gauge inches up to about 110 degrees before the fans come on!