A while back my C36 nearly overheated because the fuse supplying the Auxillary fan relays blew due to some other loads in the same circuit.

I nearly had a heart attack when I saw my temp gauge climb almost to the red zone. To prevent a recurance, I installed a relay to feed 12VDC directly off the battery into the fans, controlled by ME via a switch in the cabin.

A side benifit of this is that I can now reduce my engine temps at will to around 80 degrees simply by toggling my switch for a couple of seconds. As fellow C36 owners may have found out, the 104 engine feels stronger when temps are below 90 deg.

Coooool

I also installed a toggle switch under my dash for manual control of my auxilary fan it comes ir real handy sitting in traffic! What i did is hook the switch to the AC temp sender to make the switch low current. Works Great!
Adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

i did the same thing with my 16v. having manual control of the fan is nice, especially in slow traffic on a very hot day.

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dew
86' 190e 2.3L 16v

I did one bette rin my brothers range rover. I wired the switch up to be able to ovveride the temperature switch. That way I can turn it on at will, but it will also go on automatically as well when it needs to by itself.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon

Automatic functioning of the fans is unaffected because i put in an addional circuit, bypassing the existing relays with one of my own. Works great plus peace of mind when in traffic, knowing that high fan speed is just a flick of the switch away. Summer here in the Philippines is pretty blistering.

Does your cars feel stronger too when engine temps are in the 80's range? I notice this in my Benzes. I guess it is enrichment valve at work.

Cheers