A/C Shutting Off During High Heat

Discussion in 'Ask An Owner Operator' started by jaxwinner, Mar 13, 2018.

  1. jaxwinner

    jaxwinner Light Load Member

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    Sep 6, 2017
    Barton Arkansas
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    Since I'm in the desert and my a/c is broken atm I have a question.

    I'm driving a 2009 Kenworth T600 with a C-15. Everytime I go to a hot place like the desert or Texas and the temperature gets above 101 degrees my A/C occasionally powers off and stays off until the sun goes down and the ambient truck engine temperature cools. The gauge never shows above 220 and usually stays in the 190 range.

    Would this be a thermostat issue?
     
  2. mhyn

    mhyn Road Train Member

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    I guess you have overcharged a/c system..
     
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  3. Mattflat362

    Mattflat362 Road Train Member

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    Is your clutch fan functioning?
     
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  4. buddyd157

    buddyd157 Road Train Member

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    do you ever see frost on the a/c lines going into the evap//heater core box? (from under the hood?)

    if so, you could also have a plugged orifice tube, or expansion valve.
     
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  5. rickybobby

    rickybobby Road Train Member

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    I bet its the thermostat
     
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  6. Ridgeline

    Ridgeline Road Train Member

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    Michigan
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    How is it the thermostat?

    It sounds like the high side is really hot and the ecm is shutting it down to prevent a problem.
     
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  7. Expeditor

    Expeditor Light Load Member

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    If your gauges are correct could be bad high side pressure switch. What is your low pressure?
     
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  8. Expeditor

    Expeditor Light Load Member

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    Also check your air flow across the evaporator coil, make sure filter is clean. Make sure both coils are clean.
     
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  9. AModelCat

    AModelCat Road Train Member

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    Thermostat regulates engine coolant temperature. It has zero effect on the A/C system.
     
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  10. Expeditor

    Expeditor Light Load Member

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    I believe we are talking about the A/C thermostat, that keeps the evaporator coil from freezing. And yes it could be the thermostat. Bad thermostat or clogged dirty coil will cause this.
     
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