I would like to put a relay on the aux fan so it runs whenever the AC is on. I am thinking it should be simple enough to get signal from the pressure switch. anyone done this and have a wire diagram?

__________________

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)

why dont you just tap into a hot wire, like the compressor clutch?

__________________
1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

There is a relay in place already. All you have to do is ad a signal wire from the A/C clutch relay to the aux fan relay. I don't remember which ones they are but you can tell but turning on the A/C and waiting for the click at the relay.

I have added an electric fan in place of the mechanical fan and added MB relays to control the speed of the fan. I need to add a controller that turns on the A/C fan when I am moving less the 5 mph.

I bet someone will post the wiring diagrams for you.

__________________
1998 Mercedes E300TD

1983 Mercedes 240D Turbo, 131bar injectors, Cosworth intercooler and 63' Ford Falcon radiator, Ardic Parking heater, Headlight wipers, Best 38.6mpg.

1973 Saab 96 Rally Car, 1.8l V4 with all the race bits

so you think just jump the clutch relay on wire to the aux fan relay on wire in the relay box on the driver fender?

__________________

1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)