'87 300SDL A/C wont engage, Tach inop, ABS light on

[LakeCoastie]

Help! I am deployed in the military to GA 400 miles from home.
190k miles: I bought it in June 03 as the 3rd owner, for my wife. The previous owners kept all the maint records and used MB mechs. Good news for me. It's in great shape, except the leather!
>>The elec fan was running on high continuously, not allowing the A/C clutch to engage; it ended up being the coolant temp switch, 3-pole one, near the front of the valve cover. MB part # 0065456124 or C6020-25583 aftermarket from speedycarparts.com for $20.88.
>>NOW, I have lost the Tach, the ABS light is 'on', A/C compressor will not engage, and the blower will only work through the defrosters. Twice I started it and all the problems vanished. To date the problems remain.
I know the system is charged correctly as I put my A/C guages on when it was working one of those times. All grounds appear intact as are fuses. It has got to be a relay or brain somewhere. WHERE TO START???
>>I have no heat either, but that is prob the valve or the booster pump.

 

[LakeCoastie]

Problem fixed !!!!!

After much foul language and diligent scrounging through wiring diagrams, I found the overload protection relay to have quit. It is aluminum and has a 10Amp fuse built into the top. Funny... the fuse was OK??? It is located next to the Climate control box just to the right of the master cylinder.

OEM P/N: 2015400845 Cost was $83 w/ tax OUCH! had to get it locally

www.germanstar.net = $59.00 aftermarket p/n: P2056-18124
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