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    VWVortex


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    Thread: auxiliary water pump issues

    1. Member rdubVr6's Avatar
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      05-11-2010 10:20 AM #1
      Ok so I know most people say to just remove it because its somewhat useless but I'm trying to keep it. Now for the problem, it doesn't work at all, even replaced the pump itself. So what are the possible solutions to this problem? (Mk4 btw) and this new search either sucks or I still don't know how to use it....

      TIA

    2. Member BoostedDubVR6T420's Avatar
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      98' GTI VR6-T 98' GTI VR6
      05-11-2010 11:07 AM #2
      Have you checked the plug for continuity?
      98' GTI VR6-T | Stock Block and head, ARP Hardware, C2 Stg.2 Software, 9:1 Comp., 22 psi high boost, (NEW)Precision HP6765, Schimmel Performance SR, ATP Mani., TIAL WG, 3" SS Turbo Back exhaust and DP, Custom IC Piping, Greddy 3" IC and Type S BOV, MSD Coils, NGK BKR7E-11 (Gap .035), BFI stg.2 mounts, Preloquin LSD, Dual Stg. BC, LM-2 Wideband, FK Coils, Upgraded Suspension

    3. Member
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      05-11-2010 11:23 PM #3
      There should be 12V at the pump's connector whenever the ignition is on. If this is not the case, check the fuses on top of the fan control module (located underneath the coolant expansion tank). If the fuses are good, the fan control module itself may be faulty.
      Kenji

    4. Member rdubVr6's Avatar
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      05-12-2010 06:03 PM #4
      Quote Originally Posted by Kenji View Post
      There should be 12V at the pump's connector whenever the ignition is on. If this is not the case, check the fuses on top of the fan control module (located underneath the coolant expansion tank). If the fuses are good, the fan control module itself may be faulty.
      No power and I'm not seeing a fuse box under there...its a mk4

    5. 05-12-2010 09:21 PM #5
      There is a fuse for the aux pump in the panel on the left side of the dash, and a bigger one on top of the battery. Check those.

    6. 05-12-2010 10:27 PM #6
      Do NOTTTTTTT get rid of it

    7. Member
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      05-13-2010 01:45 PM #7
      Quote Originally Posted by rdubVr6 View Post
      No power and I'm not seeing a fuse box under there...its a mk4
      Sorry, I thought Mk4s were like Mk3s.
      Kenji

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      Jetta 5 FSi, Jetta VR6
      05-14-2010 08:13 AM #8
      why is that????

      i bypassed mine..... lemmie know what could go wrong

    9. Member VRginster's Avatar
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      05-22-2010 11:24 AM #9
      nothing will go wrong, if your coolant temp reaches over 230 then there may be problems but unlikely. I know a bunch of ppl that deleted it

    10. Member Stormgrey93's Avatar
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      05-22-2010 02:20 PM #10
      I had about the same problem.Even replaced my FCM-which I found was bad anyway,lol.But it still didn't fix it.Checked Everything.Then I replaced the yellow 4 pin switch in the thermo housing and Bam,it started working! That switch controls your After run for the pump and the fan. Find someone w/one or get one and switch them out and see if it fixes it.

    11. Member marine24's Avatar
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      1996 Volkswagen Passat VR6
      05-22-2010 02:56 PM #11
      Quote Originally Posted by Stormgrey93 View Post
      I had about the same problem.Even replaced my FCM-which I found was bad anyway,lol.But it still didn't fix it.Checked Everything.Then I replaced the yellow 4 pin switch in the thermo housing and Bam,it started working! That switch controls your After run for the pump and the fan. Find someone w/one or get one and switch them out and see if it fixes it.
      The switch is called the after-run coolant thermal switch, and yes it could be the problem.
      This might help in testing it



    12. Member Stormgrey93's Avatar
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      05-22-2010 04:56 PM #12
      Yeah,exactly.I find it's easier just to describe what it is then telling someone what it's called,lol. My Bentleys on my comp. so thats good you could show them the testing procedure. But,I am almost certain that's what it is.Been there,done that.I was pulling my hair out trying to fix it when I figured this out. There are so many sensor/switches linked to the cooling fan,I thought I'd never figure it out.Actually had it posted before the revision of Vortex.Seems noone could help me until I "stumbled" onto this fix myself.
      People Are People,So Why Should It Be You And I Should Get Along So Awfully?

    13. 06-04-2010 12:27 PM #13
      can u test the aux pump by direct 12v jumpers and see if it runs? i only ask cuz mine doesnt ha ha
      Last edited by Wolfie69; 06-04-2010 at 12:29 PM.

    14. Member Das Borgen's Avatar
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      06-04-2010 02:17 PM #14
      Quote Originally Posted by Wolfie69 View Post
      can u test the aux pump by direct 12v jumpers and see if it runs? i only ask cuz mine doesnt ha ha
      i don t see why not
      Quote Originally Posted by Das Borgen
      VR6s should sound like Chewbacca getting raped
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    15. Member
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      06-08-2010 05:46 AM #15
      bump

    16. Member ricardo's Avatar
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      1995 mulberry GTi VR6 RIP, 1988 BMW E30 SETA, 2004 A4 B6
      06-09-2010 06:03 PM #16
      FYI while in my attemp to make my car hotter (coolant always at 160F) the afterrun pump gave out....bypassed it my car now heats up quicker 9it takes half the time) and oil temps are higher (about 15*f) more and I saw a couple of spikes on the coolant to 170-180f.

      while the car looks like it doesnt need it, my car works harder to stay cool (saw the 2nd fan speed come on) getting at 230 f oil temps just driving hwy which I never did in 4 yrs since I owned it, that doesnt make me happy.. I will soon replace the afterrun pump
      "Public transportation......because you're poor"
      done everything that's cheap....broke the most expensive parts....

      having cooling problems? check this out http://the-corrado.net/forum/viewtopic.php?f=1&t=68720

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