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Old 05-30-2000, 09:35 PM
Michael's Avatar
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
My 500E just leaked about a pint of coolant out on my driveway! Leak appears to be emanating from up high on the motor, driver's side, and is leaking down all over the brake vent hoses, tranny cooler line on that side, etc. I can't pinpoint the leak by either removing the air cleaner or the belly pan....from on top everything's dry and from the bottom everything's soaked. However, there does appear to be a suspect connection-one of the lines going into the hydraulic pump (?-the device directly below the power steering fluid reservoir) seems to perhaps be the hydraulic pump water-cooled?

Even with the coolant cap released it continues to drip. Expansion tank is full...I'm sure just for the moment, and will be empty by morning. Overall it's not an extreme leak or anything, but I'm quite concerned. Any ideas out there??

Thanks in advance everyone

Best regards, Michael
'92 500E
'88 300TE
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Old 05-30-2000, 09:41 PM
Registered User
Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I don't think that there is anything that is cooled by the coolant other than the engine...I would make sure that all of the hose clamps are on tightly, I have seen them pop off before and release tension. Also, the water pump is hard to detect. You may just put your hand or finger under it and see of the weep tube is leaking. I have seen the small hose that is on top leak at the connection to the radiator. Good luck. I'd keep filling it untill found!!!

Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
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Old 05-31-2000, 06:57 AM
Michael's Avatar
Join Date: Jul 1999
Location: CT, USA
Posts: 2,699
It would seem I'm a knucklehead! Woke up and checked out the car....full of coolant, yet had leaked al night. Whassup, you ask? Well, it wasn't cooolant but hydraulic fluid! I thought yesdterday that the driping substance smeled like coolant, and it was slippery, so I jumped to the wrong conclusion. Apologies.

I think the culprit is a leaking line going into the hydraulic's canvas-covered and is soaking wet. Is this a pressurized line? I'll look into its replacement today.

thanks Donnie!

Best regards, Michael
'92 500E
'88 300TE
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