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#1
11-12-2011, 05:22 PM
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Do auxiliary water pumps typically LEAK when they FAIL?
I was wondering what sort of correlation people have noticed between a pump's FAILING and a pump's LEAKING.
Several weeks ago, I noticed that my auxiliary water pump was not working. Today, I noticed that my coolant level was slightly low. To me it would make sense that the failed pump is a likely source of the leak....but I haven't felt down there yet. So is a failed pump also often a leaking pump?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
11-12-2011, 05:33 PM
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Answer
Some do, some don't.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/
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#3
11-12-2011, 05:35 PM
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Quote:
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 154k miles 06 E320 CDI "Rutherford", Black on Tan, 172k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 142k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
11-12-2011, 06:06 PM
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VOTE
1 pump of 3 failed 0 pumps of 3 leaked.
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 "Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970
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#6
11-12-2011, 10:44 PM
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FYI
Fried ACC Board (picture) due to frozen aux pump?
Fried ACC Board (picture) due to frozen aux pump? - PeachParts Mercedes ShopForum Aux. Water Pump takes out CCU Aux. Water Pump takes out CCU - PeachParts Mercedes ShopForum I rebuilt my auxiliary water pump I rebuilt my auxiliary water pump - PeachParts Mercedes ShopForum Fixed auxiliary Water Pump!! Fixed Auxiliary Water Pump!! - PeachParts Mercedes ShopForum Auxiliary Water Pump W126 1985 300SD DIY Auxiliary Water Pump W126 1985 300SD DIY - PeachParts Mercedes ShopForum
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