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Heater Valve

Discussion in 'Mondial' started by race, May 29, 2019.

  1. race

    race Karting
    Silver Subscribed

    Feb 28, 2013
    74
    Carrollton Texas
    Full Name:
    Jeffery Mead
    I am trying to locate the Heater valve on my 85 QV it seems to be stuck on and during Texas summers make driving VERY unpleasant

    Jeff
     
  2. AndruL

    AndruL Karting

    Apr 4, 2018
    188
    Full Name:
    AndruL
    #2 AndruL, May 29, 2019
    Last edited: May 29, 2019
    Passenger footwell, up toward the right fender. You can remove the stainless steel door step, along with the under door panel cover, then follow the hoses up.
     
  3. race

    race Karting
    Silver Subscribed

    Feb 28, 2013
    74
    Carrollton Texas
    Full Name:
    Jeffery Mead
    Thank you sir. for that information.
    Jeff
     
  4. Steve Magnusson

    Steve Magnusson F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    18,966
    Texas
    Full Name:
    Steve Magnusson
    It might be more accurate to say that it is "stuck off". The 61079000 hot water valve needs to be powered to stay closed so, if you've lost +12V power to the system, it will default to the open condition. Unplug it and measure the voltage between the two terminals in the unplugged harness connector when not requesting heat with the key "on" (or engine running) = it should be +12V.
    If it is +12V, but you still get heat without requesting heat, either the valve is bad or another possibility is that the coolant hoses going to it have been swapped. There is a flow direction arrow on it to show which way the coolant should be flowing, and it will only seal if the coolant flow is in the correct direction.
    Good hunting!
     
    jkstevens2, ronfrohock and Wade like this.
  5. ronfrohock

    ronfrohock F1 Rookie
    Rossa Subscribed Owner

    Aug 16, 2004
    2,865
    MA
    Full Name:
    Ron Frohock
    Steve,
    You amaze me with your expertise. We are lucky you are here!


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