2002 VN day-cab a/c issue

Discussion in 'Volvo Forum' started by tony97905, Jul 15, 2017.

  1. Jul 15, 2017 #1
    tony97905

    tony97905 Road Train Member

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    LTL truck but good shape for it's age but, a/c intermittently quits for 5 to 20 minutes every 2 or 3 days. It has APADs system and light blinks slow/green (normal) when it quits which leads me to believe something is signaling clutch to kick out. Unit isn't freezing up, I've checked, and I replaced thermostatic switch @ evaporator. All pressure switch, bulkhead connector and clutch connections are corrosion free also. Don't see a relay for compressor clutch in PD box in dash....a/c is cold and performs well except when it doesn't....any ideas?
     
    tony97905, Jul 15, 2017
    tony97905, Jul 15, 2017
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  3. Jul 15, 2017 #2
    nasriza

    nasriza Road Train Member

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    there is a relay on top of the blower motor if you remove the top connector. what does happen sometimes is that the #### x-pansion valve will get stuck and cause high psi.
     
    nasriza, Jul 15, 2017
    nasriza, Jul 15, 2017
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  4. Jul 15, 2017 #3
    shogun

    shogun Road Train Member

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    Check what nasriza said first, but also if it's undercharged the expansion valve will freeze up. Then when it thaws, you have a/c again. Put some manifold gauges on low side and go from there.
     
    shogun, Jul 15, 2017
    shogun, Jul 15, 2017
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  5. Jul 15, 2017 #4
    Sharky88

    Sharky88 Heavy Load Member

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    Mine was doing the same thing. Turns out it was the climate control computer.
     
    Sharky88, Jul 15, 2017
    Sharky88, Jul 15, 2017
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