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#2
10-24-2004, 01:44 AM
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That's the auxiliary pump for the climate control system. Are you sure the pump is leaking and not one of the hoses? I think removing and replacing is straightforward. Drain enough coolant so the level is below the pump beofre you touch the pump.
Sixto 95 S420 87 300SDL 
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#3
10-24-2004, 01:52 AM
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didnt see your purple circle
I should get some sleep now
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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#5
10-24-2004, 03:01 AM
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Sixto
Thank you very much. You are right, it is called auxiliary water pump. It costs about $200. I just spent all my $$$ to buy this 89 300 ce. I am broke and cannot afford replacing it now. I saw the coolant leaking in between the gap of the black plastic part with screws area. Does it have a ring in between or should I tight up the screws? What is the aux. water pump for? Will I get into big problem in the future if I do not replace it.
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#6
10-24-2004, 08:34 AM
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Try tightening the four screws, worked for me when I had the exact same leak on a 89 300e. The O ring is loose or bad at the mating surface of the plastic. Also during my search for the part name the cheapest price I found was from adsitco.com for $139.00 with free shipping. Hope this helps.
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benzino Last edited by congonatty; 10-24-2004 at 08:41 AM.
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#7
10-24-2004, 11:44 AM
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You need to fix this leak pronto (try the hints first) or bypass it and unplug it. If coolant gets into the motor, it will short and fry the climate control pushbutton unit, and you will be out another couple hundred bucks to get a defroster....
If you bypass it, you will get wide variations in cabin temp as the circulation at idle isn't that good, but that's better than full heat all the time from a blown PBCU or no heat at all! Sadly, no one ever said these cars were cheap to maintain.... Peter
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1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#8
10-24-2004, 07:17 PM
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I fixed it by removing the pump and using gasket sealant all around the 2 mating surfaces.
Straightforward remove and replace.
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1999 Porsche 996 Carrera Convertible 1994 420E - SOLD 1986 300E - SOLD, what a car 609 Certified
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#10
10-24-2004, 11:02 PM
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newkid, it's fortunate that you were able to fix it simply w/ a screwdriver.
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Bernard Dallas, TX 89' 300SEL 228K 01' E320 48k
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