'85 190E 2.3 rad fan system not working - Mercedes-Benz Forum

 
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post #1 of 3 (permalink) Old 07-16-2009, 02:15 PM Thread Starter
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'85 190E 2.3 rad fan system not working

Hi, just replaced son's water pump, checked wires to the fan magnet unit but fan does not engage. Noticed this problem prior to old pump going bad. Wondering where is the senor with the temp and lead wires, or are there more than one unit that tells and sends the electrical current to the fan clutch at the fan? If I stand in front of the engine bay and look down on this four (4) cylinder engine, where is this temp unit (or others that pertain) relative to the thermostat housing unit on the right side of head front? Is there a way to check these sensors or just replace? Got a part source or is my dealer the right way to go? If aftermarket, Napa, CarQuest, etc. got the numbers?

As a new member, I want to thank those who wish to help.

I also have an '85 4 door matching parts car blue/blue if you have needs.
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post #2 of 3 (permalink) Old 07-18-2009, 05:55 PM
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The coolant temp sensor is at the forward part of the block, near the distributor, typically it has a red plastic cap with a two prong top. You can test the magnetic fan clutch by removing the wire harness to the sensor and by using a short piece of wire, short the terminals in the harness, which should cause the fan to spin.

If it does spin, the culprit is likely the sensor. If it doesn't spin, then it could be the wire harness or the fan clutch itself.
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post #3 of 3 (permalink) Old 07-20-2009, 09:46 AM Thread Starter
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2.3 190E '85 rad fan switch

I located that sensor with the red base, however, it appears to have three (3) wires attached. Two that go on one side, with one on the other. So, in response to your kind advice previously, how do I use the wire splice to test with three wires when you suggested it might be two wires? I am not very electrical at all, have some confidence, enough to do what is needed when knowing what to do. Thanks ahead of time.
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