Cabin Blower

Old 07-03-2019, 06:08 PM
Thread Starter
Join Date: May 2007
Posts: 94
Default Cabin Blower

I am fairly sure the fan to my blower motor in my 1993 240 is shot. Is there a way to make sure that it is NOT the switch or the resistor assembly before I replace it, without taking everything apart?
Old 07-05-2019, 12:16 AM
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Join Date: Oct 2010
Location: 37 North on the left coast
Posts: 10,000

i forget where the resistor is on a 240, but if you can get to it, you can test it with a volt meter.

out of the heater switch, pin 1 is low, pin 2 is medium, and pin 3 is medium-high. pin 4, a red wire is high, and goes directly to the fan without any resistors .. pin 6 is a white-black wire from fuse 3, providing power into the switch. switch pin 5 is a white-red wire from the A/C relay which forces the fan to low if the AC is on, even if the fan switch is in 0/off.

huh, the 93 wiring diagrams, it looks like the resistor is part of the motor assembly ? or maybe its right on top of the fan motor, kinda hard to tell from the diagrams I'm looking at ;-/

so if you can probe the back of the switch, you should see voltage on those 3 or 4 pins when the switch is in that position (and the ignition is on)... if you don't, its a fuse or switch or wiring problem. if you do, you'll need to dig into the heater box to get to the fan anyways.

and if you connect power to that red wire on pin 4, the fan should spin regardless of the resistor.

93 is a split year, some 93's have an additional 4 big fuse bracket right on the + terminal of the battery, while early 93s were just like the earlier years without this extra 4 fuses. these late 93s have a bunch of wiring changes (god knows why they changed so much midway through the last year of production).
Old 07-05-2019, 10:50 AM
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Join Date: May 2007
Posts: 94
Default Thank you for the information!

Thanks for the info
Old 07-05-2019, 11:04 AM
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Join Date: Jan 2006
Posts: 1,388

The resistor on the 240 is separate from the motor but it resides behind (toward the front of the car) the motor. Everything has to be taken apart to access the motor and/or resistor.

When I had to replace my blower motor I wasn't sure if I should replace the resistor at the same time. From reading online the replacement resistors aren't as reliable as the originals so I tested mine and it tested good so I reused it.
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