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#1
05-25-2002, 11:30 AM
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Can you rebuilt Auxillary Water Pump.
Hi folks:
I finally fixed my Defrost vent problem by replacing the change over valve. Thanks to tips from this forum. I have 300D Turbo 1985-123 Now I have another problem. I had a problem that in winter it took too long to get heat in cabin. Yes the monovalve was busted so I fixed it. A little improvement but still took a long time to get heat. So I did some search on the forum, found it coud be the Auxillary water pump. Power supply to the auxillary water pump is fine. So its the motor on the pump that is toasted, because with external power supply the pump would not run. Now my Question is 100+ bucks for the pump is a bit too much, so I was thinking can the motor on the pump be rebuilt? That would be a cheaper affair. If that can be done then I can put an inline fuse to protect the whole unit and others from overload. Any suggestions as to where can such motors be rebuilt. I know they do wonderful job in India. But I am in USA.( My nephew is going on vacation to India may be I can send it with him as last resort) . But is it worth rebuilding it and If you put inline fuse where do you put it. I mean on which of the 2 wires. Thanks MVK 1985 300D turbo 179,000miles
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One penny saved is three penny earned. 1985 300D Turbo 179,000miles 
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#2
05-25-2002, 01:00 PM
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Wire from pushbutton control assembly to aux. H2O pump is bk/rd ( I think) and that's where i"d put an inline fuse (say 2 amp.?). The other wire should be br. and would be ground.
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The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#4
05-26-2002, 09:33 PM
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A member named '79 Super Turtle wrote up how she rebuilt the auxiliary water pump about a year ago or so. Search on that username or auxiliary waterpump or auxiliary coolant pump and I'm sure you will find it.
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Palangi 2004 C240 Wagon 203.261 Baby Benz 2008 ML320 CDI Highway Cruiser 2006 Toyota Prius, Saving the Planet @ 48 mpg 2000 F-150, Destroying the Planet @ 20 mpg TRUMP .......... WHITEHOUSE HILLARY .........JAILHOUSE BERNIE .......... NUTHOUSE 0BAMA .......... OUTHOUSE
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#5
05-27-2002, 12:09 AM
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__________________
The Golden Rule 1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)
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#6
05-27-2002, 12:30 AM
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Hi jbaj007 and Paul
Thank you both for quick reply. I will try to do the adventure myself if i dont find anyone in neighborhood. I will post my results on this forum. MVK
__________________
One penny saved is three penny earned. 1985 300D Turbo 179,000miles
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#7
05-27-2002, 12:38 AM
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I like the challenge of rebuilding also but these aux pumps were put on many 126 chassis cars and are available used for a fraction of the price of new. Time is money and rebuilding takes time. Install a used one and take your kids out to the ball game.
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Orland Park, IL 1985 300SD 215,000 miles
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#8
05-27-2002, 01:12 AM
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Hi Billrok:
Where would I get a used one from and about how much any Ideas? Yes I rather spend time with kids and wife but at $138 for a new one, I thought of DIY. But by all means I willbuy a used one if someone can tell me where to buy it from. Thanks MVK
__________________
One penny saved is three penny earned. 1985 300D Turbo 179,000miles
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#9
05-27-2002, 07:53 AM
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Manual On-Off for Aux Pump
My pump is fine, but it doesn't go on. PSFRED, wonder where he has been by the way, said that the push button control unit is probably fried due to over amp draw from the pump.
I wonder if there is some way to spice in a manual switch and wire in the aux pump directly so I can just flick it on........ JCD
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#10
09-19-2002, 09:55 PM
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Auxillary Water Pump
does anyone know if 1984 380sl has an auxillary water pump and where it is located
my cas is running at 180 and near red at times had water punp changed had radiator changed the mech didnt change the thermostate before i do i would like to know if the car has an auxillary pump thanks
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#11
09-20-2002, 12:29 AM
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"trees",
The aux pump is to pump more hot water thru the heater core to get more cabin heat and won't help much to cool the engine. The thermostat should have been changed first. Always replace the lowest priced parts first. I wouldn't have much faith in your mechanic. Hundreds of dollars spent and no improvement? The whole problem might be fixed by a $10 part. P E H Last edited by P.E.Haiges; 09-20-2002 at 12:34 AM.
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