APU thermo king startup scortching hot.

Discussion in 'Questions From New Drivers' started by dboot01, Nov 13, 2023.

  1. Nov 13, 2023 #1
    dboot01

    dboot01 Light Load Member

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    Just got in a truck with an apu for the first time. Why when I put the heat on it comes on lava hot for 5 minutes then turns off again? Is this a censor thing or what? I know the batteries are fine. I have to keep turning it off and on again to get it going
     
    dboot01, Nov 13, 2023
    dboot01, Nov 13, 2023
    #1
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  3. Nov 14, 2023 #2
    tscottme

    tscottme Road Train Member

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    Is the heat being produced by a seperate system or are you just twisting the temp knob from cold to hot. In every APU I had the heat came from a seperate fuel heater and the A/C came from the APU's air conditioning system. If the heat comes from a fuel heater (Webasto?) you have a fault in the fuel heater. In every APU system I had the heat produced by turning the temperture knob to hot was barely room temperature, at best. I think I have only ever had Thermoking APUs. I never had battery-based, Carrier APU, or other gadgets.
     
    tscottme, Nov 14, 2023
    tscottme, Nov 14, 2023
    #2
  4. Nov 14, 2023 #3
    Judge

    Judge Road Train Member

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    if it hasn’t been used in long time, may have to keep it going a bit, fuel in heater may be old.
    try it a few times to get good fuel to it.
     
    Judge, Nov 14, 2023
    Judge, Nov 14, 2023
    #3
    dboot01 and tscottme Thank this.
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