No heat?

Discussion in 'Mack Forum' started by ChicagoJohn, Aug 22, 2016.

  1. ChicagoJohn

    ChicagoJohn Road Train Member

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    This morning it was in the 50's so I turned off the AC button and thought I turned on the best/defroster, but all I got was cold air
    I have the bunk lines closed, but is there another valve that could be closed for the summer? Truck was fully warmed up, but still no heat. It's a 2008 CXU613.
     
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  3. BoxCarKidd

    BoxCarKidd Road Train Member

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    Manual valves at the engine heater hoses is the first place to look.
     
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  4. ChicagoJohn

    ChicagoJohn Road Train Member

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    That fixed it. Turns out when I had the AC repaired this summer, they clamped the lines closed. I thought it only effected the bunk, but it was everything. Works great now.
     
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