My 300D 2.5 begins to run hot in traffic with the ac on. I noticed the ac fan is coming on, but the second fan does not, unless I physically get it turning. And then, it turns slower than the ac fan, though the temp gauge is saying about 100c.

My question is, can the fan be taken apart and loosened up? Or does it maybe have a flat spot and it needs to be replaced. Looks expensive...

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1984 300Sd 210k

Former cars:
1984 300D 445k (!!) (Strider) Original (and not rebuilt) engine and transmission. Currently running on V80 ( 80% vegetable oil, 20% petroleum products). Actually not, taking a WVO break.
1993 300d 2.5 275k. Current 120/day commuter
1981 300SD 188k (Hans) Killed by a deer

Yes it's expensive.

If you're lucky, the windings haven't toasted yet.

Usually it is due to leaves and junk behind the fan, try loosening the assembly to look/clean behind it.

If it is the fan itself, Remove the fan assembly, remove the fan blades with the large nut on the front, and you can lubricate the motor bushings.

If one fan is running slow/drawing lots of power, it will slow the other down until the resistor burns out.

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Gone to the dark side

- Jeff