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Peterbilt 386 HVAC Blend Door Broken

Discussion in 'Peterbilt Forum' started by AFX, Feb 27, 2020.

  1. Feb 27, 2020 #1
    AFX

    AFX Bobtail Member

    17
    4
    Apr 17, 2016
    0
    I recently purchased a 2007 Peterbilt 386 and noticed it stopped blowing hot air out of the cabin. I checked the lines going to the heater core and they were both hot. I checked all the blend door actuator and they were working fine too. When I opened the heater core/evaporator access door, I could see through a small opening that the blend door itself had broken free of the rod that connects it to the actuator. Upon further investigating I realized my fresh air door is also broken and I'm guessing so is the mode door as the system only blows air out of the front vents. Does anyone know how to go about replacing the blend doors?
     
    AFX, Feb 27, 2020
    AFX, Feb 27, 2020
    #1
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  3. Feb 27, 2020 #2
    pushbroom

    pushbroom Road Train Member

    1,769
    7,205
    Sep 1, 2012
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    I don't believe they are sold separate. Gotta replace the entire HVAC box. Not too hard but time consuming.
     
    pushbroom, Feb 27, 2020
    pushbroom, Feb 27, 2020
    #2
    spsauerland Thanks this.
  4. Feb 27, 2020 #3
    AFX

    AFX Bobtail Member

    17
    4
    Apr 17, 2016
    0
    Any general instructions on how to remove the HVAC box? Thanks
     
    AFX, Feb 27, 2020
    AFX, Feb 27, 2020
    #3
  6. Aug 24, 2022 #5
    Ebonific

    Ebonific Bobtail Member

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    Sep 20, 2020
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    Take off air intake. Turn wipers on, then turn ignition switch off when wipers are up.
    On top of the unit, right under the windshield below wiper connecting rod, unbolt the two 13mm nuts. The are an additional two 13mm bolts on both sides. Clamp 2 heater core hoses. Evacuate AC system. Unscrew 10mm nut from evaporator. Pull those two lines away. Unscrew 10mm hose hangers bolts from the unit. Move those 4 lines(ac and heater core) out of the way, towards driver side. Unit should pull straight out.
     
    Ebonific, Aug 24, 2022
    Ebonific, Aug 24, 2022
    #5
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