I've got mine direct wired with switch.I only use it for city driving.I'm going to see if I can get a thermo fan switch.

e-fans
 

Check out my photobucket website i have 3 Bosch e-fan "only 2 showing new pictures not added yet" this week end i am doing major things to my car e-fan's are great your car warms up quicker, i have more things to say but i am too tired tonight to type them i will later! take care guys! ill update my pictures soon..................... hummmm BEER

The car won't warm up any quicker if your thermostat is working correctly.

i knew you were going to say that lance but i seen a tiny difference between both! i like the clutch fans but now as much as e-fans. especially Bosch e-fan's they blow so much cfm its insane ill take new pics this weekend! of my car and of my new High Performance Tuning Shop!

The electric fans will do the job when you're moving, and in cold weather Canada, but idling in traffic on a hot day you'll find that the alternator can't keep up with the electrical demand unless you upgrade the alt.

Mercedes for some reason wasn't very aggressive with alternator output through the mid-90s.

My next step is to purchase a 150 amp.That should give me extra power.But my alt still holds 14.5 volts running line heaters,filterheater,lights,heater on high,and fan.

That guy called "Joe Tech" on ebay has new fan clutches for many MBZ models for $98. It's aftermarket though, so beware.

until I came across this thread I didn't realize my fan was clutched. it appears I have the aluminum fan, and that the clutch has failed in the "always on" mode.

I went with fattywagons 85 amp. Its plug and play.Plenty power.Installing a Jegs fan control this week.Its adjustable.