Question about the auxiliary water pump in the nose of the car | FerrariChat
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Question about the auxiliary water pump in the nose of the car

Discussion in '348/355' started by hacker-pschorr, Jul 7, 2009.

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  1. hacker-pschorr

    hacker-pschorr Formula Junior

    Sep 27, 2006
    584
    Land of Lambeau
    #1 hacker-pschorr, Jul 7, 2009
    Is this pump strictly used when the heater is on to pump coolant through the heater core or is it also used as a kind of booster pump to keep things circulating when / if temps increase?

    Does it ever turn on when the engine is off (like when the fans continue to run) to keep coolant circulating through the radiators?
     
  2. Llenroc

    Llenroc F1 Veteran
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    #2 Llenroc, Jul 7, 2009
    It is there to circulate water thru the heater core when the car is idling.
     
  3. No Doubt

    No Doubt Seven Time F1 World Champ

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    #3 No Doubt, Jul 7, 2009
    You can turn it on with the motor off by turning on your heater inside the cockpit with ignition key turned back to Run (not Start). It's electric, of course, so it runs off of battery power with the motor off and it pumps out something reasonable like 8 gallons per minute so it is feasible to gain a little post-driving cool-off with it.
     
  4. PaulK

    PaulK F1 Rookie
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    #4 PaulK, Jul 7, 2009
    Is this just for the 348 or both?
     
  5. No Doubt

    No Doubt Seven Time F1 World Champ

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    #5 No Doubt, Jul 7, 2009
    Both. Same A/C-Heater system.
     
  6. hacker-pschorr

    hacker-pschorr Formula Junior

    Sep 27, 2006
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    #6 hacker-pschorr, Jul 8, 2009
    Good, that's what I wanted to hear since I bypassed the pump due to a leak. I noticed after driving the car, once the engine is off the coolant temp gauge would rise a bit. Nothing extreme but enough to make me wonder if the electric pump is supposed to kick on.
    I'm trying to source a new pump since $700 for a Bosch pump of that style is over ridiculous. I've talked to my Bosch rep, there is nothing "special" about that pump (on top of that the part number is NLA). Once I find a suitable replacement, I'll share it with the group and Daniel at Ricambi.
     
  7. No Doubt

    No Doubt Seven Time F1 World Champ

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    #7 No Doubt, Jul 8, 2009
    Last edited: Jul 8, 2009
    $35 here: http://cgi.ebay.com/ebaymotors/BOSCH-AUXILIARY-WATER-PUMPS--TESTED-&-CLEANED-!-!-!-!-!_W0QQitemZ380137098439QQcmdZViewItemQQimsxZ20090707?IMSfp=TL090707185006r37896

    "0 392 020 002"

    $58 new from here: http://catalog.eautopartscatalog.com/archsoftware/importedcarpartspfp/quote.jsp?partner=pacific&partnerSession=02a429121852be3e6b0a9a64b997f02f&product=0%20392%20020%20002

    $62 new here:http://www.bestsourceautoparts.com/partsCatalog/geturl/wizard/year/1993/make/MB/model/300-DT-003/category/G3050/part/Auxiliary+Water+Pump/pageFrom/catalog

    It's a 1989 Mercedes 300E electric water pump
    It's also a 1993 Mercedes Benz 300D Turbo 2.5 electric water pump
    Bosch# 0392020002
    Mercedes Part #:000-835-8064
    Also known as part #: G3050-293593
     
  8. hacker-pschorr

    hacker-pschorr Formula Junior

    Sep 27, 2006
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    #8 hacker-pschorr, Jul 8, 2009
    I figured someone already looked into this, didn't find any threads.
    The part number on the pump is 0 392 020 007

    The information I received from my Bosh rep: "There is an 006 and an 008 but no 007 and they both are VW pumps and look the same as the one in your picture. Both the 006 and the 007 supersede to a Bosch 039202054"

    I didn't really think about it until I noticed the temperature climb after shutting off the engine, so I figured I might want to look into it's full purpose :)
     
  9. No Doubt

    No Doubt Seven Time F1 World Champ

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    #9 No Doubt, Jul 8, 2009
    Old Bosch 0 392 020 007 is new Bosch # 0392020054 ... $128 here: http://catalog.eautopartscatalog.com/archsoftware/importedcarpartspfp/quote.jsp?partner=pacific&partnerSession=02a429121852be3e6b0a9a64b997f02f&product=0392020054

    $120: http://automotive.neebo.org/bosch-auxiliary-water-pump-g3050-13422

    Other sources: http://frugalmechanic.com/auto-part/29172-bosch-w0133-1605189-auxiliary-water-pump

    That's also known as part# G3050-13422
    Equuivalent to Audi/Volkswagon #034 965 561C, 034965561C
     
  10. 348Jeff

    348Jeff Formula 3

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    #10 348Jeff, Sep 23, 2014
    Bosch Part# 0392020054 has now been updated to part# 0392020039
     
  11. ClydeM

    ClydeM F1 World Champ
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    #11 ClydeM, Sep 23, 2014
    make sure you post these numbers in the crossreference thread please.
     
  12. 348Jeff

    348Jeff Formula 3

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    #12 348Jeff, Sep 23, 2014
  13. 348Jeff

    348Jeff Formula 3

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    #13 348Jeff, May 26, 2021
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  14. Ritter Rost

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    #14 Ritter Rost, Mar 25, 2022
    I installed a BOSCH 0 392 022 024 and I wonder about the wiring and rotation direction.

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    At the plug of the pump...

    • brown goes to red, and
    • black to green.
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    I am not an electrical expert, but I always thought red was plus? According to the multimeter, in the vehicle it is minus. I tried the pump before on the lab power supply, and there the water flowed at red = plus as the arrow on the pump housing indicates.

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    In the vehicle it should flow the wrong way round, against the arrow on the housing. The interior gets warm, but only when the engine is above 4000 rpm.

    At idle speed, it immediately becomes cold again.Could it be that green is plus 12V and red is minus (ground)?
     
  15. jjtjr

    jjtjr Formula Junior

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    #15 jjtjr, Mar 25, 2022
    When running the pump, look into the suction port (the one in the center, not side) with a flashlight and you will see the impeller and it should rotate clockwise when power is applied.
     
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  16. m.stojanovic

    m.stojanovic F1 Rookie
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    #16 m.stojanovic, Mar 25, 2022
    I can see that the new pump has a Bosch standard 2-pin connector on top. Check whether there are "+" and "-" symbols anywhere around the connector. If not, perhaps you can follow the attached drawing (another Bosch pump with a somewhat different connector) which shows that, when looking from top, "+" is on the right. The red and green wires that you have are not of an original Bosch cable but an aftermarket pigtail supplied with the pump so I would not follow its wire colours.

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  17. Qavion

    Qavion F1 World Champ
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    #17 Qavion, Mar 25, 2022
    According to the F355 5.2 wiring diagram, red is indeed an earth (supplied by the HVAC ECU). Green is power from fuse 24 (on a 5.2 car). The diagrams actually show a green/white wire.
     
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  18. Ritter Rost

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    #18 Ritter Rost, Mar 26, 2022
    You have helped me a lot, thank you very much. Especially the last statement brings clarity that green is the voltage supply. Somehow strange, but somehow also modern, after all, electricity is a green energy. :D

    I have reversed the polarity of the plug, now it should fit. I have not tried it yet, but it would be logical that it now works.
     
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  19. cactussed

    cactussed Formula Junior

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    #19 cactussed, Oct 31, 2024
    Minor update, having just done this job...
    The biggest faff is removing and refitting the damn carpet!

    Also, the generic Bosch pump I used sits slightly higher than OEM with the wiring plug on top, so I had to shuffle it down in its bracket a bit.
    Also, the barbs were fractionally bigger than the OEM pump, so had to warm the hoses to get them to slip over (no big deal).

    Hey presto, I now have a working and non-leaky heater system again.
     
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  20. PaulK

    PaulK F1 Rookie
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    #20 PaulK, Oct 31, 2024
    Thanks for the update. This will help others in the future on what to expect and how to proceed. Thanks!
     
  21. 348Jeff

    348Jeff Formula 3

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    #21 348Jeff, Nov 1, 2024
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