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  #1  
Old 01-28-2008, 12:13 PM
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Join Date: Mar 2002
Location: Rochester, NY
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'87 300D PWR Steering and Tranny

I have been battling a leaky transmission for weeks now as well as disappearing power steering fluid. Initially, I had a leak in one of the hoses for the power steering. I have replaced the hoses and no more leaks. I will be ordering a replacement tranny pan as I think mine is warped. My question is whether the tranny fuid and the power steering fluid is tied together somewhere. I put clear power steering fluid in the resevoir, but there is now red fluid in there. I wouldn't have thought these two systems were tied together, but who knows what those German engineers will do. I am really tired of tracking down all of the leaks on this car and am ready to have them all behind me. While troubleshooting this problem yesterday, I discovered a dried up hose coming off of the secondary fuel filter...i was leaking diesel all over the place. I think i just need to replace every rubber item on the car.

On a separate note, while replacing the rear differential bushings Saturday, I accidentally broke a cable going to the differential. Once I broke it, my "Antilock" light on the dash stays on. I am assuming this cable senses something in the rear end and is tied to the antilock break system. Don't know why this would be tied to the rear-end, but this is all I can come up with.

Lastly, I just came across a thread detailing a connector under the carpet in the rear of the car for the locks. I am going to dive into this later today, but if this isn't the problem, are there any switches, etc. behind the driver's door panel that control the locking system? I have replaced the pump, connectors, etc. and the locks still don't work. I wish Merecedes had stuck with the locking system from the 123 as I would have had this problem fixed by now.

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  #2  
Old 01-28-2008, 12:36 PM
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Join Date: Jan 2006
Location: Northeast Indiana
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The PS fluid is separate from the transmission fluid, probably red/ATF in the pump which is now mixing with your clear PS (Valvoline?) fluid. There's a filter in the reservoir also.

The differential has an ABS sensor in it. The sensor is plugged into the passenger side toward the front / input end of the differential. The other end of the ABS sensor wire is plugged in behind/under the back seat on the passenger side near the locking pump, runs through a grommet out of the car at the bottom right/center of the seatback.

There is a switch in each locking cylinder: (2) front doors and (1) trunk lock that actuate the locking pump. In the doors, you can get to the plug by opening the door, look in the jamb at the rear of the door and you'll see an oval black plug. Pull that plug out of the door and it should be holding the connector to the lock cylinder.

Bad rubber is the price you pay for being in a hot climate. Up here in the north the rubber stays supple forever, but the metal goes bad.
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Old 01-28-2008, 01:01 PM
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Join Date: Mar 2002
Location: Rochester, NY
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Thanks for the help. I have been battling all kinds of issues on this one for quite some time now. I have given great thought to fixing the rest of the problems and selling it, but the more I fix, the more I like the car. To date, I have replaced the evaporator core, the front and rear shocks, the rear suspension links, the front balls joint, tie rods, steering dampner, new turbo (dealer warranty) when the trap fell apart, water pump, engine shock and pulley, and I am sure I am missing a few other parts. All in all, I can't think of many more major items that can go wrong with this one. I am really leaning towards keeping it as the interior is just about perfect and the body and paint look new when it is washed and waxed. These cars are just a whole lot more comlex than the 123's.

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'87 300D
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