Notes on AC Compressor Replacement - Turning and adding oil - PeachParts Mercedes-Benz Forum

rhodes2010 · #1 06-29-2006, 01:03 AM

I installed a brand new and dry (no oil) compressor onto my 300D.
Put it in place and used the yellow (steel color) washer on large line (low pressure and the thicker Green washer on the high side.

The low pressure line has a fitting conveniently located above the compressor
where I was able to set a small funnel and add the 4 ounces of oil.

I took two 1/4 inch female spade electrical connectors and attached to two pieces of 3 foot wire (16 or 14 guage). Attached these to the compressor magnetic coil and to my battery charger (set the charger to 2 amps at 12 volts).

Now I was able to use a strap wrench (Harbor Freight cheapo) to turn
the compressor clockwise to circulate the oil.

It is all buttoned up and has been drawn down with vacuum and is sitting overnight. Tomorrow I will add the freon.

I used Harbor Freight vacuum pump and my compressor to pull the vacuum.

So far so good.

Oh, and one more thing. I replaced the AC Evap in the interior with one from the 81 300D (this is a 1980 300D). Well, they are not exactly the same size and it required a marriage of the three major pieces that make up the housing for the AC evap. Two lower parts from the 1981 mated to the 1980 upper section.

And I determined that replacing the older ACC II system with vertical buttons and the heater servo underhood with a newer version using the horizontal buttons would have required the wiring harness to be pull and separated probably up to the fuse box. This subject has been talked about, and in my opinion is not practical - even given unlimited amounts of time and parts.