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  #1  
Old 09-17-2004, 02:20 PM
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Join Date: Sep 2004
Posts: 28
Windshield Washer Pump, W210

I shut my car (99 E300) down yesterday and noticed a really strange sound coming from under the hood - sizzling, popping, hissing, ticking.

Finally tracked it down to the windshield washer fluid pump, which must be starting to leak a bit of air (unless this is normal behavior!) I'd just used the washer fluid before pulling into the garage, so this makes sense. It stopped after a few minutes.

Any ideas? Cost and ease of replacement, if needed?

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  #2  
Old 09-18-2004, 02:54 AM
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Join Date: Jul 2001
Location: Woolwich, Maine
Posts: 3,598
bmisf,

I am not sure about the W210, but the other models (W124 and W123) are not a big deal to replace, except for the cost. I am sure they are not giving them away. Never heard mine hiss or make any noise, but you may have a leak that is dripping on the exhaust manifold. That might make noises. If the pump keeps working I would try looking for a leak as I doubt the pump is the problem if it keeps working (hissing coming from an electric motor driven pump is usually a sign of the pump expiring).

Jim
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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)
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  #3  
Old 09-18-2004, 08:26 AM
wagger
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sounds to me like the egr or wastegate control valves leaking mine did the same a few weeks ago , they look just like a windscreen washer pump. the egr control valve is located on the inlet manifold side of the engine compartment & the wastegate valve is located beside the turbo. i replaced both of mine
yours may only leak occaisonally, so dont rush into changing them just yet.
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  #4  
Old 09-18-2004, 09:05 AM
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Join Date: Aug 2001
Location: Milford, DE
Posts: 1,558
This kind of noise is normal - it's caused by residual vaccum leaking thru the transducers that control boost and EGR. My 98 and 92 diesels do the exact same thing. I'm a but surprised you could hear the ticking without raising the hood - you must have pretty good hearing.
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  #5  
Old 09-18-2004, 12:45 PM
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Join Date: Sep 2004
Posts: 28
Thanks, all - I'll keep my "ear" on it, since everything seems to be working fine for the moment. All good suggestions for where to look if it seems to get worse.

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