Hvac Temp control too sensitive.

Discussion in 'Kenworth Forum' started by TNeverending, Mar 25, 2014.

  1. TNeverending

    TNeverending Bobtail Member

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    Feb 27, 2014
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    I just bought a 2011 T660. I am having a problem keeping the temperature comfortable. It seems the air blowing from the vents is either hot or cold. Not much in between. Does anyone else have a problem with this?
     
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  3. TNeverending

    TNeverending Bobtail Member

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    Feb 27, 2014
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    I have a T660 with studio sleeper. Problem is the sleeper heater fan will not turn down very low. It has three positions and changes speed in all of them. But on the lowest one it still blows so hard that it sounds like it is on high. Is this normal or do I have a faulty switch?
     
  4. CondoCruiser

    CondoCruiser The Legend

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    If you are speaking of the diesel fired bunk heater it is probably designed that way to keep the unit from overheating. If you are speaking of the climate control that runs off your engine coolant you do have a lot of duct work is probably why it's designed that way. It does have a fan resistor block that an OO can change the fan speed values by buying a different one with greater resistance. If you are a company driver you can close off some vents and open only the top ones.

    Back when I use to idle I would close the front curtain and use only the dash heat and wouldn't bother with the bunk heat unless it was real cold out.

    But a problem? Nah it's normal unless it's being fed an excessive amount of voltage or the blower itself has a short in the windings which I doubt.

    As far as the temperature control there should be a blend door in the duct work. I'll see if I can't find more info.
     
    Last edited: Mar 25, 2014
    TNeverending Thanks this.
  5. TNeverending

    TNeverending Bobtail Member

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    Feb 27, 2014
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    I am talking about the blower motor for the hvac not the bunk heater. Where would I find the resistor that you talked about? Near the motor or the fan switch.
    I also have problems trying to mix the air to a comfortable temp. (I drive team with my wife) Seems to be either hot or cold. Not much in the middle, but then the front (cab) temp control seems to have the same problem.
     
  6. CondoCruiser

    CondoCruiser The Legend

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    This is a random fan resistor I was talking about. Even the bunk heat has one somewhere near it's blower motor. It controls the fan speed.

    http://www.bigrigworld.com/air-conditioning-and-heating/resistor-12v.html

    Under the bunk you should see a big box with two pipes going into. That is where your heater core is housed. Then you will see duct work attached to it. Right in that area should be the blend door and it's either opened and closed by an electric motor, a cable, or an actuator valve. Anyone of them three can be bad.
     
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  7. Down under trucker

    Down under trucker Light Load Member

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    Jun 22, 2012
    Brisbane, Australia
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    Do you have a tap on the coolant line for the hvac? If you do try closing it a bit, it will slow the flow of coolant into the hvac and might stop the heater being so hot so you can get the perfect setting
     
  8. TNeverending

    TNeverending Bobtail Member

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    Feb 27, 2014
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    I'm not sure. This truck is new to me. It would be under the hood if it had one, right?
     
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