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The W124 fan should already run at two speeds...
The fan on the W124 is a single speed fan that runs at two speeds...
When the air conditioning is on and the pressure switch on the receiver-drier gets to a certain pressure, the fan runs at slow speed because of a resistor placed behind the left headlight.
When the temp sensor on the block gets to a certain temp (fairly hot) the fan will begin to run at the higher speed.
Because I don't like a hot running diesel, I have bypassed the resistor and the fan always runs at the faster speed....
The resistor is something you may want to check during the summer season, because if your resistor is bad, the engine gets hot fast when in city traffic.
The Tenor Man
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Currently Driving.....
1987 Mercedes Benz 300D Turbo - Daily Driver.
2004 Buick Rendezvous...Smaller than it looks!
2005 Mitsubishi Galant - Not bad for a tin box...Lousey Seats
Past Vehicles.....
1994 Dodge B-250 Van- GAS HOG..Succumbed to rust!
1989 Mercedes Benz 260E - Totaled but no one injured.
1977 Mercedes Benz 240D - Loved it, but SLOWWW! - Succumbed to RUST!
1976 Mercedes Benz 240D - Same as above! -
1975 Mercedes Benz 240D - Same as above!
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