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Old 01-13-2003, 04:09 AM
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Holy crap!!!

The clutch fan is not engaged ALL THE TIME.

It just free wheels and there is a 2mm gap maintained. It doesn't lock-up at all.

I disconnected all the elect. fans and let the temp go up to 110 deg and the clutch fan does not lock up.

I will look at wiring the clutch fan to come on with the high speed elect. fan.

Mods aside, the car does not overheat running with the 2 elect. fans at 30 to 33 deg outside temp. Running temp. is about 85 to 90 deg. If I let the car idle in Park, it will do so without overheating even on a very hot day.

However, it came close to 105 deg the other day when I was stuck in a really longgggg jam...that was too hairy for me!!!

However, with the clutch fan sensor wires disconnected (there is a short in the wires, remember?), the fuse for the tach/clutch fan still blows (no tach). I will still have to trace for the short.

I insist to wire the clutch fan to the elect. fan even if i get the short sorted out coz I am very uncomfortable with the clutch fan's "turn-on" temp.

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Old 01-27-2003, 07:43 AM
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I failed, sob...

Haven't found time to trace the short coz Babybenz was whacked in the rear by a truck last week and I just got her from the bodyshop today.

I guess I'll be off to the Merc tech tomorrow to get the short sorted out...

Babybenz 1991 190e 1.8
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Old 02-02-2003, 10:13 AM
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Thumbs up Now we're gettin' somewhere!!!

Still trying to get to the short that's causing fuse #10 to blow, therefore, no electromag fan and no tach...

I couldn't find the time to drop Babybenz off at the tech's shop...and by the time I could, it's a long weekend holiday here.

So I took the air cleaner housing out and took a look at all the connections/disconnections at the sensors on the valve cover.

To-date, the electromag fan connections at the sensor have been removed coz they were found burning when the electromag fan was on.Even now, fuse #10 still blows with these connectors to the sensor removed.

Removed a single pin connector and found that it was the engine temp sensor, so I put it back on.

Looked closely at the electromag clutch and traced 2 small wires back to just below the air cleaner housing area. One was to ground and the other went to a small round connector.

Disconnected this wire and renewed fuse #10 and walah!!!! The tach is back!!!

I was really getting into the swing of things when it started to get dark...

Damn!!!I was just starting to have fun...

Anyway, tomorrow, I will apply +12V to the wire and see if the electromag clutch engages. I will fuse the wire just in case there is a short in the clutch itself (I doubt the clutch is faulty).

If it works, I guess the short exists in the wire running back to the sensor. If it gets difficult to pull the old shorted wires out, I would run a new wire (fused) from the battery to the sensor, then back to the clutch, and this should work...

This is gonna be fun.

Damn, these cars are really fun to work on!!!

I'll post my findings asap for the benefit of other 190e owners. This should be especially interesting to anyone with a 1.8 like mine...


Babybenz 1991 190e 1.8
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Old 04-29-2003, 08:01 PM
haasman's Avatar
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Join Date: Jun 2001
Location: San Francisco, CA
Posts: 3,097

What did you find regarding your electromagnetic engine fan?

'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)
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Old 05-01-2003, 02:37 PM
Posts: n/a
Electromagnetic Clutch


It was a fried electromagentic clutch.

The day after my last post, I tested the clutch by directly applying 12V to the clutch supply wires (the two thin wires) and NO click!

By the way, the supply wires going to the clutch were really stiff and some of the insulation had fallen off in places (due to the heat from the short).

So I went out and got myself a new clutch ($60), a new set of supply wires for the clutch ($10 - this connects to the clutch via connector and the other end goes to the sensor/ground; a straightforward replacement) and drove the car to an indie to get the stuff replaced.

30 minutes and the same amount of dollars (labor) later, it was done.

Having seen how it was done, I figure I could have done it myself but i didn't wanna fiddle with the belt.Having seen how the belt is taken off, tensioned, etc I feel more confident if I ever need to replace a water pump or whatever...

Anyway, running temp. is around 82 to 85 deg C and the ambient temp. where I come from is about 30 deg C.In stop-go traffic, the temp is between 85 to 90 deg but never close to 100.


Babybenz 1991 190e 1.8
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