Good Morning!!!

Wanted to pick your collective brains for a few....

On my 116.120, I have been driving it with the A/C discharged for the past few months. The A/C worked perfectly before my sons' accident in 2006. I taped off the lines while the car was in storage and I have been driving it again since June of 2009.

I have had the compressor unhooked (front seal leak) but the blower would always switch to high speed when you flipped the compressor switch on. The weather has been getting hot, so I decided to fix it....the right way.

I installed a new aluminum billet climate control unit, amplifier, schrader valves, auxiliary water pump, receiver drier, condenser and compressor recently. All of the blower speed functions are perfect and all of the vents are working properly. Late last night, I hooked up the compressor and flipped the switch and blew #9 fuse. I double checked the clutch coil and it works fine and the amperage to apply the clutch is within spec. Now, the high speed blower is on all the time (when you have the A/C turned on that is) and I am getting no current to the A/C clutch coil, but #9 fuse has continuity. Everything else in the climate control system is working perfectly. Is there a relay that controls this???? I can't find any service information on this thing so I am kind of puzzled.

Also, I charged the A/C with R-12 and the correct amount/type of oil, but once I got the compressor running, the low pressure side went into a vacuum. No noise, no clutch slippage, just 28 in/hg of vacuum on the low side. My guess is the expansion valve must be stuck....at least I think the 116 used an expansion valve, so it looks like that will be my next project, unless it decides to unstick itself....:-)

I really appreciate all of your time...Robert

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Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013



100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership