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#1
10-12-2009, 07:35 PM
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Aux pump relay?
Hi. On a 1984 300D Turbo can anyone tell me where the relay (if there is one) for the Aux water pump is located.
Direct 12V to the pump makes it run OK. New (used) heater control unit works all the right things but no heat. Thanks
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom 
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#2
10-12-2009, 07:56 PM
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#3
10-12-2009, 09:15 PM
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Thanks Tango. ? behind the unit or inside the plastic unit case. The wiring diagram shows a temperature switch and a vacuum switch in the supply line to the Aux. motor. Do you know where these items are located on the engine?
Thanks for your help
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom
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#4
10-13-2009, 07:57 PM
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#5
10-14-2009, 07:24 PM
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Removed the Aux pump, bench test. Runs well, quite, smooth. Reinstall
Removed the ACC unit, fine sanded the relay points. Reinstall. Now the pump runs but intermittent. When the pump runs I get heat, mono valve is working. Great! Regarding the schematic. For the ACC unit only the power to the Aux pump seems very direct from the button switch to the motor. BUT from the schematic for the whole car (1980) there are two switches. Is there a more current schematic?
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom
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#6
10-15-2009, 12:47 AM
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Which physical relay on the board did you work on? I have been trying for some time to equate output loads to the various relays with little success.
Looking from the side of the board where the relays are visible, which of the "O"s below was the one for the aux pump? Thanks in advance. I____O___O__O_____I I_________O________I I__________________I I__________________I ~T~~T~~T~~T~~T
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1961 190Db retired 1968 220D/8 325,000 1983 300D 164,150 Last edited by Lycoming-8; 10-15-2009 at 12:54 AM.
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#7
10-15-2009, 06:43 AM
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This might help.... That is if you can see it.  This is the wire harness diagram. #51 and 52 ends at the pump.   .
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1983 123.133 California - GreaseCar Veg System 
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#8
10-15-2009, 10:27 AM
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1980 still used the servo, while the 1984 does not. You need to look at a 1984 schematic.
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RRGrassi 70's Southern Pacific #5608 Fairmont A-4 MOW car 13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete. 99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K 90 Dodge D250 5.9 Cummins/5 speed. 400K Gone and still missed...1982 w123 300D, 1991 w124 300D
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#9
10-15-2009, 10:54 AM
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If you're not getting any heat, the problem isn't the aux pump because if it does not work you get reduced heat but you still get heat. When I unplugged my pump until I got it fused, I noticed a difference but it was pretty minimal, only enough to make a difference in the dead of winter.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#10
10-16-2009, 02:24 PM
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1984 300SD turbo 126 "My true love" God made me an atheist and who am I to question His wisdom
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#11
10-16-2009, 02:46 PM
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I have exact same problem. No power to aux pump... and like you said, direst power to pump makes it work.
http://www.peachparts.com/shopforum/showthread.php?t=263066 So there is a relay to this pump???? Help!! Dave!!! Bryan!!!! Jimmy!!! Roy!!!!
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the sooner you start... the sooner you'll get done  If it ain't broke, don't fix it.. Its always simpler to tell the truth... 2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa
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#13
10-16-2009, 04:20 PM
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If you do sand the contacts, using dielectric grease on them before re-attaching them will help with the conductivity and prevent corrosion, ensuring a more reliable and long lasting connection.
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1984 300D
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#14
10-16-2009, 06:12 PM
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the sooner you start... the sooner you'll get done If it ain't broke, don't fix it.. Its always simpler to tell the truth...2007 Honda Accord EX 2007 Honda Accord SE V6 96 C220 97 Explorer - Found Another Home 2000 Honda Accord V6 - Found Another Home 85 300D - Found Another Home 84 300D - Found Another Home 80 300TD - Found Another Home Previous cars: 96 Caravan 87 Camry 84 Cressida 82 Vanagon 80 Fiesta 78 Nova Ford Cortina Opel Kadet 68 Kombi Contessa
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#15
10-16-2009, 08:19 PM
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if you take apart the climate control unit youll find 4 relays. Hook up the ccu plugs and you be able to find the relay that is always switching on when the dial is on heat. That is the one. Take a screw driver and bridge the relay pads with a screw driver. If the pump starts you know its that relay. Sand the pads and put electrical grease like the poster above suggested. I made a thread a few weeks ago about how i fixed mine
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 1981 300SD 512k OM603
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