2015 T880 Blend door actuator

Discussion in 'Kenworth Forum' started by johnr1252, Nov 10, 2022.

  1. johnr1252

    johnr1252 Bobtail Member

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    Nov 10, 2022
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    Working on a 2015 T880 that has a manufactures date of Dec. 2014. The cab heater is not working but the fan is blowing. Found Blend Door Actuator was bad, it had a stripped gear inside. Bought new actuator and tested before installing. The actuator only turns counter clockwise as you are looking at the end of the shaft. This would make the blend door go to the A/C side and block the heat. It will not turn the opposite direction. Is it the HVAC controller with the 3 knobs on the dash that tells the actuator which way to turn. The actuator only has two wires so the polarity must be reversed to make it turn the opposite direction. Trying to decide if it's the controller that needs replacement. Thanks
     
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  3. Arctic_fox

    Arctic_fox Road Train Member

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    I cant speak 100% towards the kennys but on peterbilt the controls are hooked into the CCU and after you install a new blend door needs to be updated via davie4. Mine did something pretty simular when i swapped the doors and actuators until i had it programmed by pete.
     
  4. johnr1252

    johnr1252 Bobtail Member

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    Nov 10, 2022
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    Programming has been discussed and I will make that call tomorrow and find out if that could be it. I would have thought that they would have said something when we purchased the actuator from Kenworth!
     
  5. Arctic_fox

    Arctic_fox Road Train Member

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    I thought the exact same thing when i got mine from pete. But they told me they assumed i had a davie4 already since i was comfortable basically removeing 80% of my bloody dashboard to get at the blasted box.

    That said if the programming doesnt fix it have them run a full calebration and diagnostic. It has a better then even chance of turning up whats wrong.
     
  6. johnr1252

    johnr1252 Bobtail Member

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    Nov 10, 2022
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    Thanks for your reply
    Thanks for your input, its appreciated!
     
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