Quote:
Originally Posted by Arthur Dalton
The problem with deleting the resistor by jumpering it is that will get you high fan, BUT, the wiring from the pre-resistor relay is not as heavy as the high speed circuit . So , the trick is to use the feed wire to the rsisitor [ single wire side] to a power relay and feed that relays output to the 2 wire side of the relay..that gives you high fan with a/c instead of low fan w/o a problem with the wiring for low fan.......... Fuse that new line w/25 A
If you do not use the low fan for a/c , you can also put a cabin sw jumper at the drier sw to activate it manually from the cabin..that is a popular mod for Benz guys ..great to have a manual over-ride for traffic, towing, etc..and that does not change any stock fan cicriuts, it simply gives you manual command over them. [ like puting the heater on to cure an overheat condition]
You can also lower the high fan circuit if you have the blu 2 wire sensor for high fan by bridging that sensor with a resistor for lower temp cut-in.
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FWIW- on an early W124 gasoline that's being upgraded to dual-fans OR running the low-speed fans in "high mode", you must either use a separate relay as Arthur suggested OR upgrade all the wiring, fuse holder, and preferably the "ice cube" relays with the newer style relays with fuses, to prevent melting items, and a potential fire.
I updated my 300TE to the late-model dual fans, and even when run in "low-speed" mode, I was melting fuse holders, and wiring, all the time.
I finally ran a 10-gauge stranded copper wire for relays feeds, as well as from the low-speed relay to the aux. fan resistor.
I measured 11-amps on the "ice cube" relays, and 23-amps on the high-speed circuit. These "ice cube" relays were replaced with the newer relays with ATC fuses on their side (15-amp and 30-amps).
By doing so, I basically upgraded everything to the 1990+ circuit, although with 10-ga. wire which has reserve capacity, instead of 12-ga.
No more melted wires or fuse holders.
:-) neil