W126 Aux fan still not coming on - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 06-26-2013, 09:15 PM Thread Starter
BenzWorld Member
Date registered: Jan 2012
Vehicle: 1970 Mercedes 220D
Location: California
Posts: 61
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Unhappy W126 Aux fan still not coming on

My aux fan on my 1987 300SDL does not come on when engine reaches above temp or when ac is turned on. I changed the thermostat with a new BEHR one and I also changed the 3 prong fan aux switch attached near the valve cover. I still can not seem to get the fan to work. I did check the fan by hooking it up directly and it works fine. I also unplugged the 2 prong plug from the 3 prong switch and when I ground a cable from the fuse box and connect one of the inlets, the fan goes on when the ignition is switch to on. Do I need to change the other one prong aux switch that is next the three prong aux switch?

Last edited by My 220D; 06-26-2013 at 09:17 PM.
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