This is my first newer benz,a 98 E300TD.Just want to jump the pressure switch to verify ac clutch.No use putting in r134 if the clutch is bad.This car has a 3 wire plug on the switch.On the 124's it was just a matter of touching both wires together to turn on the ac clutch to listen for any weird noise.The lady i bought the car from ,who seems honest,say's the ac just quit on her.She claims this happened before and there was a fuse under the passenger foot well area that needed to be replaced.???I did check all three fuse box's and all is well.None of the fuse box's are on the passenger side.So who knows ...The fan and heat work very well.
So anyway i just want to check the clutch before i go into anything else.
Thanks
Rich

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88 300E White, sold 9-04
88 190E Black 2.3 sold
90 300CE White, Grey sold 12-24-04
92 400E White,Grey Sold 5-06
90 300CE 91K Signal Red,Black Sold 2007
1989 300CE Smoke silver,Tan Sold 1-08
1993 300E 3.2 M104 motor
1991 300CE White,Grey
1994 E420 beautiful car,gone to new home
1994 E320 Smoke an Parchment.Beautiful car

Read this article and pull actual values and error codes. Actual valves wont help much until it runs. Note codes, and then erase. Hold both auto buttons to erase each code while in error mode. If EC light goes off, then try AC again.

http://www.continentalimports.com/ser_ic40142.html

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Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)