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Old 10-22-2000, 07:46 PM
Registered User
Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358
The neither the 5-blade cooling fan, nor the secondary electric fan are engaging when the engine temp rises. How do I trouble shoot this? The secondary electric fan engages when the A/C is operating. I have an '85 Euro model with three sensors in the theromostat housing. Going from right to left the first switch has three wires, and I assume is the temp switch for the solenoid fan coupling and the 2-stage aux fan. I assume this witch is bad. How do I check it? The second switch (two-wire) is for retarding the CIS ignition system as the temp rises. How do I check it? It is supposed to retard he ignition by as much as 5 degrees as the temp changes. I have no idea if it is functioning or not. (On my 190SL I make this adjustment manually when driving on a hot track or hot (summer)city streets.) I have no idea what the third (single pole) switch is for. All fuses look good.

Robby Ackerman

190 SL
190 E 2.3-16
300 D
Past President
Virginia Section MBCA
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Old 10-23-2000, 05:12 PM
Join Date: Mar 1999
Location: Tucker, Ga USA
Posts: 12,153
Unless the engine goes above 105C none of the OVERHEATING switches operate. Fan clutch doesn't lock up until 100C. How hot does the engine run?

27 YEARS DEALER M.B. Shopforeman
190E 2.3 16V ITS SCCA racecar
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Old 10-23-2000, 08:11 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358
it will creap up to 120 C without engaging.
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Old 10-23-2000, 08:15 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358
The car is equipped with a manual (override)switch the aux electric fan. I've been turning it on at about 115 C and off at 90 C.
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Old 10-24-2000, 09:13 AM
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yal yal is offline
Join Date: Oct 1999
Location: New York, Long Island
Posts: 2,704
Change the switch...its most likely the fan switch. Inexpensive. Give your vin# and you should get the right one but I believe there is only one 3 prong one. The secondary fan will kick in when the AC is on. Does the override switch engage the big fan? I have never seen it an aftermkt add on? If so is it fused?

88 230E (W124)
smoke/red tailights
98 e420 sport replicas
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Old 10-24-2000, 08:23 PM
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Join Date: Jun 2000
Location: Near Williamsburg, Virginia
Posts: 358

The aux fan switch was in the car when I purchased it. It can be used to turn on the Aux electric fan at will. I expect it is fused. This switch is rocker switch between the passenger window switch and the right side mirror control. I'll order the part you mentioned. Thanks.
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