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Old 08-29-2008, 02:49 PM   #1 (permalink)
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Date registered: Aug 2007
Vehicle: 1998 E320 4matic wagon
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wagon with what looks like hydraulic fluid leaking

just slightly in front and to the inside of the front left tire I'm seeing drops on the garage floor, looks like Hydraulic fluid so I cleaned the area around the washer tank and hydraulic tank to look for obvious leaks. nothing yet anyone delt with a similar leak? The tank was down at the min level and I filled it to the max line and have been monitoring.
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Old 08-29-2008, 02:57 PM   #2 (permalink)
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Inspect the power steering lines and the rack assy for leaks..seen a few racks leaking on the W210 Wagons

Peel back the boots on the rack to see if the seals are leaking as the boots will be filled up with fluid
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Old 08-29-2008, 03:18 PM   #3 (permalink)
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Start by removing your sound proofing panels since the fluid tends to travel and drop off away from the actual leak.

Clean the underside cross members, lines, oil sump and anything else which is oily. If the leak has been going on for some time you may need to do this twice.

I had a small leak which I thought was from the hydraulic system/PS system. I thought it was that system because the level in the reservoir flucuated.

Turned out the leak was from the gasket sealing the breather cover to the left valve cover. Others have had a leak from the base of the oil fill tube which is also located in that cover.

Good luck.
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Old 08-29-2008, 11:28 PM   #4 (permalink)
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I have a hydraulic oil leak on the left front pretty much directly at the bottom from where the hydraulic oil reservoir is located. There is a stain where I park.

Are these hydraulic reservoirs known to leak?

I also have a leaking left rear strut.

My suspicion is these many owners and non MB shops are not familiar with the self leveling suspension and as such that reservoir might be filled with ATF, power steering fluid, brake fluid or even windshield washer fluid.

This might eventually leaking to leaking seals in the hydraulic system. As such it would be wise to flush out the system when buying a used wagon.
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Old 08-30-2008, 01:21 PM   #5 (permalink)
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starting to think compressor oil

the top of the compressor is hard to see and it sits right below the power steering pump but it looks like the oil is coming from the compressor. The oil color is clear so it's not motor oil.
AC still runs pretty good. Compressor presure on #7 of diagnostic is now 14 and a couple months ago I remember it being 16
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Old 08-30-2008, 02:32 PM   #6 (permalink)
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Is your power-steering fluid clear? Mine is.

If you are leaving puddles of compressor oil on the ground, your AC won't be working. Oil never leaks out by itself.
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Old 08-30-2008, 03:11 PM   #7 (permalink)
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my hydraulic oil is clear also

looks like the drips are coming from either the compressor or just above.
the oil looks like the same consistancy as the hydraulic. does this typically indicate the power steering pump itself? It's hard to see, but from above everything looks dry.
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