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Thread: Hot water valve

  1. #1
    Senior Member davidc89's Avatar
    Join Date:  Feb 2015

    Location:  Minnesota

    Posts:    281

    My VIN:    2347

    Hot water valve

    I am replacing the hot water valve, as the bypass that the previous owner put in failed, and I can't seem to find where the vacuum hose is that goes to it. Any suggestions?

    Also in troubleshooting why my cooling fans did not come on at idle, I notice the Fan Fail relay was missing and it wasn't bypassed... Maybe that could be the issue?

    Thanks,

    David 2347
    Everyone is tough through a keyboard

  2. #2
    Senior Member Chris 16409's Avatar
    Join Date:  May 2011

    Location:  Fresno, CA.

    Posts:    1,181

    My VIN:    16409

    If your fan fail socket is empty you will never have the cooling fans come on. You need to install a jumper or buy one of Dave M's solid state fan fail relays.
    Chris Miles

    For Better or Worse I own a DeLorean!
    1983 Grey Manual, VIN #16409, Fresno, California

  3. #3
    TGTF (Too Greek to Function) AugustneverEnds's Avatar
    Join Date:  Jul 2012

    Location:  Syracuse, NY area

    Posts:    718

    My VIN:    SCEDT26T5CD010287

    Club(s):   (DMA)

    The vacuum hose comes from the driver's side pontoon, up in the corner, small diameter yellowish color. At least on mine, I am assuming all Ds are the same in this department.

    Look at the upper left hand side of this pic: https://www.google.com/search?q=delo...kH6kM:&spf=198

    Bypass the fan fail if you are in a hurry, fused jumper wire if you prefer or Bitsyncmaster's solid state if you like.
    Last edited by AugustneverEnds; 05-05-2017 at 10:34 PM.
    Nick A.
    Νικος Αυγουστινατου

    1988 BMW 325iS
    1982 DeLorean DMC-12

  4. #4
    Senior Member davidc89's Avatar
    Join Date:  Feb 2015

    Location:  Minnesota

    Posts:    281

    My VIN:    2347

    I bypassed the relay as stated and still didn't work. I jumped the otterstat and the fans would run. So I'm not sure if I still have air in the system or a bad otterstat.
    Everyone is tough through a keyboard

  5. #5
    Senior Member Rich's Avatar
    Join Date:  May 2011

    Location:  San Francisco Bay Area, Calif.

    Posts:    1,511

    My VIN:    0934

    Club(s):   (NCDMC) (DCUK)

    Quote Originally Posted by davidc89 View Post
    I am replacing the hot water valve, as the bypass that the previous owner put in failed, and I can't seem to find where the vacuum hose is that goes to it.
    The OE hose is thin, stiff black plastic tubing, not a flex hose. It feeds out of the forward left wall of the engine bay (from driver side pontoon as mentioned) through a rubber grommet. On the end of it a short black coupling (rubber hose) connects it to the heater valve port.
    March '81, 5-speed, black interior

  6. #6
    Senior Member hippieman9's Avatar
    Join Date:  Jan 2018

    Location:  Haw River, NC

    Posts:    209

    My VIN:    06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001.

    should you be able to depress the lever on the hot water valve by hand? I am trying to see if mine is bad. Doesn't move no matter what setting the switch is on at the console.

  7. #7
    Senior Member
    Join Date:  Sep 2014

    Location:  West Sayville, N.Y.

    Posts:    1,348

    My VIN:    005058 000927

    Club(s):   (AZ-D) (DMA) (DOA) (DCUK)

    Quote Originally Posted by hippieman9 View Post
    should you be able to depress the lever on the hot water valve by hand? I am trying to see if mine is bad. Doesn't move no matter what setting the switch is on at the console.
    Yes. Sounds like yours is seized.
    Rob

  8. #8
    Senior Member hippieman9's Avatar
    Join Date:  Jan 2018

    Location:  Haw River, NC

    Posts:    209

    My VIN:    06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001.

    Quote Originally Posted by PJ Grady Inc. View Post
    Yes. Sounds like yours is seized.
    Rob
    Ok, I can depress it by hand, but doesn't seem to work with the mode switch.

  9. #9
    Senior Member Bitsyncmaster's Avatar
    Join Date:  May 2011

    Location:  Leonardtown, MD

    Posts:    7,097

    My VIN:    03572

    Quote Originally Posted by hippieman9 View Post
    Ok, I can depress it by hand, but doesn't seem to work with the mode switch.
    You can just pull the vacuum hose and connect another hose that has vacuum to test it. Or just check that vacuum hose for vacuum when the AC is set to MAX
    Dave M vin 03572
    http://dm-eng.weebly.com/

  10. #10
    Senior Member hippieman9's Avatar
    Join Date:  Jan 2018

    Location:  Haw River, NC

    Posts:    209

    My VIN:    06668 81' Grey interior, 5 speed, Grooved hood. Previous owner of 16301, in 2001.

    Quote Originally Posted by Bitsyncmaster View Post
    You can just pull the vacuum hose and connect another hose that has vacuum to test it. Or just check that vacuum hose for vacuum when the AC is set to MAX
    So I have a vacuum tester, and I pulled vacuum on the hot water valve and it works, I traced the vacuum line to the mode switch to find that it was not plugged in. Also found that the flap under the passenger footwell wasn't working and that these work on the same vacuum line, Well the rubber line was unhooked from the Tee. I plugged it back in and the foot well flap moves slightly, and the hot water valve still doesn't move.... Looks like I must keep looking. Is there a diagram that shows what line goes where on the back of the mode switch?

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