heater control valve location

Discussion in '100-Series Cruisers' started by lexs470, Mar 24, 2005.

  1. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    I see. Most of the time it is pressured but sometimes its not. Thought maybe a closed Tstat may be restricting hot air from getting into cab.
     
  2. Julian Stead

    Julian Stead

    Messages:
    1,368
    Likes Received:
    347
    Joined:
    Dec 19, 2015
    Location:
    United Kingdom
    No, it circulates without the stat open, the stat only controls the flow through the radiator.
     
  3. Julian Stead

    Julian Stead

    Messages:
    1,368
    Likes Received:
    347
    Joined:
    Dec 19, 2015
    Location:
    United Kingdom
    You can make sure the jiggle valve on the stat is at the top, this allow air to pass when filling up the coolant.
     
  4. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    Gotcha.
     
  5. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    Continuing.... I think I have air out of system by inclining, squeezing hoses,watching bubbles come up and coolant go down. Heater Ts always seem fairly warm.

    Right now the ambient temp is about 30* Ive driven about 6-8 miles, temp guage went to normal as it should, temp control to hot, cold air coming from all vents. ?? Rear heat has hot air
     
  6. Julian Stead

    Julian Stead

    Messages:
    1,368
    Likes Received:
    347
    Joined:
    Dec 19, 2015
    Location:
    United Kingdom
    If your happy with the Tee pipes being hot then you need to check the operation of the air mix servo. Turn the heat control and see if you hear and see it function.
     
  7. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    Yes I can look underneath and see and hear the mechanism moving. Not sure if heater Ts are hot as they should be but they’re hotter than the air thru the vents it seems. Maybe I need to flush heater core.

    Right now the vent air is a little warm but foot is cold
     
  8. PADDO

    PADDO SILVER Star

    Messages:
    1,540
    Likes Received:
    789
    Joined:
    Sep 27, 2007
    Location:
    Charlotte NC or ACT area Australia
    Here’s how to put the system in check mode to run diagnostics on the air mix servo and sensors, might help to narrow the problem down.
     

    Attached Files:

  9. Julian Stead

    Julian Stead

    Messages:
    1,368
    Likes Received:
    347
    Joined:
    Dec 19, 2015
    Location:
    United Kingdom
    It’s worth giving it a flush. The heater Tees should be hot. The hoses going to the heater core that is.
     
  10. abuck99

    abuck99 SILVER Star

    Messages:
    2,272
    Likes Received:
    1,327
    Joined:
    Nov 8, 2015
    Location:
    ATL
    You could also doulble check the Tstat functionality- seeing if the valve opens at the proper temp 176-183F deg. Then check valve lift (fully open) 10mm @ 203F deg, fully closed below 104Fdeg. Would require a new gasket I believe- or just spend $16 and replace the tstat.
     
  11. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    GOT HEAT!!! I flushed heater core with water hose at low pressure. Dirty water came out. I flushed until water was clean. Buttoned her up. Inclined truck to burp system. Now it seems to have made a big difference. Pretty warm

    It’s 39 out and I’ve got to roll my windows down now to get this heat out.

    Thanks for all the help!!!!!
     
    Julian Stead likes this.
  12. Julian Stead

    Julian Stead

    Messages:
    1,368
    Likes Received:
    347
    Joined:
    Dec 19, 2015
    Location:
    United Kingdom
    Glad it worked out. When you change the radiator be sure to do a full system flush and a complete coolant change.
     
    BullElk likes this.
  13. BullElk

    BullElk

    Messages:
    1,432
    Likes Received:
    609
    Joined:
    Jun 19, 2013
    Location:
    Mobile, AL
    Oh yes I sure will do that. Funny how you can own the same type vehicles for 22 years and still not be familiar with fixes like this. It’s because things rarely happen that need fixing. In my experience.
     
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.