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Old 09-21-2000, 12:04 PM
Registered User
Join Date: Oct 1999
Location: Memphis
Posts: 189
Hey there,

I have an '86 190E 2.3-16V (US spec). WHen I sit at idle the temp. raises up and wants to keep going, the fan won't kick in like it's supposed to at 100 celcius. When the traffic clears up and the car starts moving the car cools down though. So that tells me that my cooling system is good. It's just that dang fan. I'm told that it is more than likely my fan clutch and/or the sensor for the fan. I'm also considering a fan actuator switch of some sort. Please MB gurus, enlighten me. I already ordered a Mosselman turbo kit for my car and I don't need the thought of overheating engine to keep worrying me. Thanks again MB gurus. Later.


Clinton Davis
'86 190E 2.3-16V
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Old 09-21-2000, 12:18 PM
Registered User
Join Date: Jul 2000
Location: Sunny Florida
Posts: 199
Is the electric fan in front of the radiator supposed to turn on at 105 C or when the a/c is on? I have heard both, and only found reference to the 105C turning it on when searching the old posts. I am curious, as I would think it is the same on my 560SEL.

1989 560SEL (127k)
1971 Cutlass convt. (98k) (sold)
1978 Olds Toronado (68k) (sold)
1977 Camaro (sold)
1984 300ZX (146k)(sold)
(only a 2 car garage explains a lot....)
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Old 09-21-2000, 01:34 PM
Mike Murrell's Avatar
Registered User
Join Date: Feb 2000
Posts: 2,141
First off - I'm not a pro.
Your 190E I believe has what's referred to as an M103 engine in it. There are various sizes, but if yours is an in-line 6 cyl, Single Overhead Cam(SOHC), this is what you've got.
Many M103s have a fan relay that runs off of the A/C receiver drier, near the A/C low pressure switch. The fan is activated(I think) when the refrigerant pressure reaches a given point or the engine temp reaches 102F(in the case of my M103). I suppose your fan relay could be faulty; then again, it could be an number of things. Try searching the archives.

Mike Murrell
'91 300-SEL
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Old 09-21-2000, 01:45 PM
Posts: n/a
Mr. Pres:

I think your fan kicks in at 105C, not 100C.

Try sitting at the light a little longer.

'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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Old 09-21-2000, 04:14 PM
yal's Avatar
yal yal is offline
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,704
EHhhhhhh! 190E 2.3 is an M102 engine, 4cyl, I have it on my W124. It has an electromagnectic fan not a clutch. It kicks in at 105C give or take depending on year. If its cool enough outside and your radiator is old it will just hover in heavy traffic near the 100C mark and never trigger the fan...annoying as hell.
The fan switch is screwed into the top of the the engine behind the oil cap. If you are going to order a new one make sure you give your vin number so you get the right one. Hope this helps.

88 230E (W124)
smoke/red tailights
98 e420 sport replicas

[This message has been edited by yal (edited 09-21-2000).]
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Old 09-21-2000, 08:18 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
Good answer Yal.

Donnie Drummonds
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Old 09-22-2000, 12:37 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
As stated the fan is designed to come on at HIGH temps. You can get a fan switch that allows fan to come on at 100C instead of 105C. Its a red 3 pole switch & MB# is 006-545-42-24.

27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar
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