Where is the shroud on a Mercedes-Benz W124 cooling fan?
Remove the clip that holds the shroud to the radiator on the left side. The clip is located between the two hoses (red arrow). Using care slide the shroud out between the fan and the radiator (red arrow). Slide the guard off the fan and remove it between the fan and radiator (red arrow).
Where are the relays in a Mercedes-Benz auxiliary fan?
In addition to what Sixto has provided — There are two relays in the relay box (behind the fuses) that turn on the fan in high or low speed, depending on which switch, as described by Sixto, is activated. The relays are usually reliable. I would check the high-pressure switch in the refrigerant line first.
How to remove a Mercedes Benz cooling fan?
Slide the guard off the fan and remove it between the fan and radiator (red arrow). This photo illustrates how the plastic pegs on the guard (yellow arrows) sit in the corresponding receptacles (red arrows). To remove the fan and clutch you will need Mercedes-Benz tool # 104 589 00 01 00 or you can make one out of 6mm rod.
When does the W124 auxiliary fan come on?
If so, where is that guy. It’s temp controlled, comes on only when it needs to. Cheers! The fan has two speeds. Low speed is triggered by the AC high pressure switch, the switch with pigtails on the drier. Jump the pigtail ends and the fan should come on.
How does a Mercedes Benz auxiliary fan come on?
Jump the pigtail ends and the fan should come on. High speed is triggered by the coolant temp switch, the one on the upper radiator hose turret on the cylinder head. Jump the contacts on the 2-pin connector and the fan should come on.
If so, where is that guy. It’s temp controlled, comes on only when it needs to. Cheers! The fan has two speeds. Low speed is triggered by the AC high pressure switch, the switch with pigtails on the drier. Jump the pigtail ends and the fan should come on.
How does the coolant sensor work on a Mercedes Benz W124?
There are two coolant temperature sensors on the W124. The single pin sensor sends its signal to the temperature gauge in the dash while the two-pin (or in some cases four-pin) sensor sends its signal to the fuel injection management system. Let the car cool so you don’t have to work around a hot engine.
How does the low speed aux fan work?
The aux fan’s low speed circuit doesn’t respond to ambient or system temperature, it responds to refrigerant system pressure. The FSM suggests the high pressure switch triggers the aux fan at 20bar/290psi. Bridge the pigtails on the high pressure switch with the engine running and compressor engaged.
What causes a Mercedes Benz to stall and not start?
Symptoms of a defective crankshaft position sensor on a Mercedes-Benz. Engine Cranks but no Start, Dies, Stalls, or Backfires. A failed crankshaft position sensor can cause your engine to stall or not start at all. Your Mercedes-Benz may start and run for a short time, or until it gets warm and then it dies.
What do you need to know about the Mercedes W140?
Water Pumps, Radiators, Thermostats, Antifreeze, Radiator Hoses, Tanks and Parts more… The Mercedes-Benz W140 S-Class is a series of flagship luxury vehicles produced from 1991 to 1998. SE and SEL variant with a long wheelbase were the first to be available in North America followed shortly by the SEC coupe.