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Old 05-16-2003, 02:13 AM
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190E Aux Fan Questions again...

OK sorry for posting another aux fan question. I did do a search and have psoted before but still no luck. herea re my questions please help.

1987 190E 2.3 78,000 miles. I have never heard the aux fans engage on this vehicle and now when I am driving I am getting funky guage readings. Most of the time it is decent, no higher than 100. But the last two days it is going higher (sometimes to the red line for a minute and then quick down to normal then back up again) and higher and nothing is engaging (aux fans). From what I have read so far it seems to either be a relay or a sensor??. Here are my questions in this model what can i do to make the fan go on, what do i pull to trigger them in the engine. Which sensor if disconnected will trigger them and also where is it? if this does not trigger it then I assume it is a relay? Where is this located in my vehicle? I looked in the fuse box and I have at th rear of it two boxes, silver and black and a space next to them that is empty? (not sure if something is missing or just an option I do not have?) From reading here I am thinking that I need a relay? I see nothing with a fuse on top of it? Ugh, thanks for everyones help. I would take it to the dealer but I have a feeling it is something easy or simple that I can diagnose myself but am having no luck) So to summarize:

1. What can i pull in the engine to trigger the fans

2. If this does not work than I can assume it is the realy hopefully? Where is it and what does it look like?

As you can see I very green when it comes to repair but it seems like I should be able to do this right? ugh, thanks
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Old 05-16-2003, 08:41 AM
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Join Date: Mar 2003
Location: New Hampshire
Posts: 158
on my 88 190e 2.3, I was able to engage the fan by pulling off the harness from the sensor on the top of the block, closest to the front of the car. My sensor has a red base. Then I held a staple in a pair of needle nose pliers and pushed the staple into the harness I had pulled off the sensor. Then the fan came on. I ended up needing a new sensor. Now the fan works fine.

BTW, this is for the fan driven by the electro magnetic clutch. Not the aux. electric fan.

If I remember correctly, i think I pulled off the harness of the sensor behind this one and the aux. fan came on automatically. Worth a try.
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Old 05-16-2003, 04:37 PM
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bump, help please?
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