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HVAC Problem: Help Please!

Discussion in 'Freightliner Forum' started by Jellsworth19, Aug 20, 2013.

  1. Aug 20, 2013 #1
    Jellsworth19

    Jellsworth19 Bobtail Member

    26
    2
    Feb 2, 2013
    Carlsbad, NM
    0
    Hey ALL, I have a very peculiar problem with my 2001 Century. When I turn on my A/C switch the A/C condenser gets cold but the heater core also gets hot. Hence all I get is hot air from the system.

    Initially I put the truck in the shop... thinking maybe there was a leak somewhere? But after they tested the system (results were normal), then evacuated it and recharged it... its doing the same thing... blowing HOT air. Yesterday we removed the dash panels and found that the heater core was running with the A/C switch on.

    Here's my question... how is this possible? And how do I fix it?

    Thanks for reading.
     

    Attached Files:

    Jellsworth19, Aug 20, 2013
    Jellsworth19, Aug 20, 2013
    #1
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  3. Aug 20, 2013 #2
    dude6710

    dude6710 Road Train Member

    2,162
    622
    Mar 26, 2010
    MN
    0
    Your blend door is stuck
     
    dude6710, Aug 20, 2013
    dude6710, Aug 20, 2013
    #2
  4. Aug 20, 2013 #3
    jbourque

    jbourque Heavy Load Member

    924
    553
    Oct 25, 2012
    south english iowa
    0
    put a manual shut off in the hot water line, or fix the blend door.
     
    jbourque, Aug 20, 2013
    jbourque, Aug 20, 2013
    #3
  5. Aug 20, 2013 #4
    Jellsworth19

    Jellsworth19 Bobtail Member

    26
    2
    Feb 2, 2013
    Carlsbad, NM
    0
    ok thanks dude6710 and jborque. I looked all over for a blend door when we had the dash apart yesterday but could not find it. Where should it be?

    Today I went ahead and bypassed the heater hoses and problem solved!
     
    Jellsworth19, Aug 20, 2013
    Jellsworth19, Aug 20, 2013
    #4
  7. Aug 20, 2013 #5
    Boardhauler

    Boardhauler Road Train Member

    1,634
    2,951
    Dec 21, 2008
    Ballin' in it for Shakey
    0
    You should have shut off valves for all heater hoses on the engine. I shut mine off in the summer, just as a routine thing.
     
    Boardhauler, Aug 20, 2013
    Boardhauler, Aug 20, 2013
    #5
  8. Aug 20, 2013 #6
    Jellsworth19

    Jellsworth19 Bobtail Member

    26
    2
    Feb 2, 2013
    Carlsbad, NM
    0
    I may be a lil blind... where exactly are the shut off valves?
     
    Jellsworth19, Aug 20, 2013
    Jellsworth19, Aug 20, 2013
    #6
  9. Aug 20, 2013 #7
    kwswan

    kwswan Road Train Member

    1,798
    9,063
    Jul 26, 2009
    mcminnville,tn.
    0
    The shut off valves will be in the lines going to the heater core somewhere,different places depending on engine & model of truck. Just follow the hoses from the firewall throught the engine compartment & you should be able to find them if it has them.
     
    kwswan, Aug 20, 2013
    kwswan, Aug 20, 2013
    #7
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