W900L A/C issue update

Discussion in 'Kenworth Forum' started by mile marker 27, Aug 9, 2020.

  1. mile marker 27

    mile marker 27 Road Train Member

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    It’s on one of the A/C lines.
     
  2. Rideandrepair

    Rideandrepair Road Train Member

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    Must be a thermostat, controlled by temp knob. I’m wondering why both lines are cold. Must be partially open. I’d try to get those wires hooked up, where they need to be, and insulate the expansion valve, especially the temp bulb, before changing it.
     
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  3. mile marker 27

    mile marker 27 Road Train Member

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    Why is there one for the sleeper and not the cab?
     
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  4. Rideandrepair

    Rideandrepair Road Train Member

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    I think it’s thermostat type set up, to keep temps consistent. Someone familiar with Kenworths would know.
     
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  5. Rideandrepair

    Rideandrepair Road Train Member

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  6. spsauerland

    spsauerland Road Train Member

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    The wires cut are for the solenoid that controls refrigerant flow to sleeper expansion valve. Should click when you turn sleeper A/C on. Sleeper water flow is controlled by a electric water valve. Also is a temp sensor in panel that goes bad too, the sleeper A/C is early vintage automatic temp control. Get me last six of VIN and I can get sleeper wiring diagram and help you more.
     
  7. mile marker 27

    mile marker 27 Road Train Member

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    There is two wires coming from the harness( I believe) that may have been hooked to the wires on the solenoid??? Can the temp sensor be bypassed or ran without it? So, my expansion valve might be good?
     
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  8. mile marker 27

    mile marker 27 Road Train Member

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  9. spsauerland

    spsauerland Road Train Member

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    Here is wiring diagram and breakdown of parts. Might not be exact breakdown of you panel. If you read the wiring diagram, mode switch allows to cycle blower motor or the refrigerant solenoid valve. I couldn't find the relay and thermostat P/N's on ECAT. This is older HVAC system than I have worked on in past!
     

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