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Help western star

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jcurran90, Nov 15, 2021.

  1. Nov 15, 2021 #1
    Jcurran90

    Jcurran90 Light Load Member

    53
    8
    Apr 29, 2016
    0
    I have a 2007 Western stat 4900 with no heat… heat works great in the sleeper but no
    Cab heat. I already replaced that plastic valve on the firewall, didn’t help … coolant is good … is funny bc I remember last year around March I was driving and the heat was on then it just started blowing out cold air … so I said I’ll just deal with it next winter will here we are and I guess I have to
    Figure this out … how big of job is the heater core ??? What else should I check before I do that ???? Thanks guys
     
    Jcurran90, Nov 15, 2021
    Jcurran90, Nov 15, 2021
    #1
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  3. Nov 16, 2021 #2
    Don379

    Don379 Heavy Load Member

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    1,286
    Jan 7, 2021
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    Not familiar with sleeper truck layout but I’m assuming the sleep unit has its own heater core and thermostat. So I would start by looking at the supply and return off the cab heater core. Check for hat on the heater core itself. Then move up to the blend door and thermostat control
     
    Don379, Nov 16, 2021
    Don379, Nov 16, 2021
    #2
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