92 prelude A/C compressor cutting off

Discussion in 'Prelude' started by mark, Jul 10, 2004.

  1. mark

    mark Guest

    Does anyone know the possible causes for my a/c compressor cutting
    off? It runs about 50% of the time and is new. What gives signals to
    the a/c relay to open? There is no pattern as to speed, or how long
    it's been running. It also has a new relay, evaporator coil and dryer.
    Please help.
     
    mark, Jul 10, 2004
    #1
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  2. mark

    E. Meyer Guest

    If you have the temperature bar all the way cold and the fan on max and it
    cycles, it means the Freon charge is either too little or too much - it will
    cycle in either case.
     
    E. Meyer, Jul 10, 2004
    #2
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  3. mark

    Randolph Guest

    When the outside temperature is only moderately hot, it is normal for
    the A/C to cycle on and off. Does the system keep the car cool?

    There are two relays in the A/C system. One switches battery voltage to
    the A/C compressor clutch, the other switches batter voltage to the A/C
    condenser fan.

    The relay coil for A/C condenser fan gets battery voltage from the
    ignition switch and gets ground through the series connection of the
    thermostat mounted on the evaporator, the A/C on/off switch and finally
    the cam on the ventilation fan that is on whenever the ventilation fan
    is on (any speed but off).

    The relay coil for the A/C compressor clutch gets battery voltage from
    the ignition switch and is grounded by the ECU. The ECU gets the A/C
    request through a series connection of the A/C high pressure switch, the
    thermostat mounted on the evaporator, the A/C on/off switch and finally
    the cam on the ventilation fan that is on whenever the ventilation fan
    is on (any speed but off).

    When the ECU gets an A/C request, it will bump up the idle speed a bit,
    enrich the idle mixture a tad and then turn on the compressor. For
    trouble shooting purposes, the trip through the ECU is only a small
    delay.

    Check under the hood if the condenser fan and A/C compressor both cycle
    on and off at the same time. If the fan keeps running after the
    compressor has stopped, it usually means that the over-pressure switch
    has been tripped (e.g. due to too much refrigerant in the system).

    If the fan and clutch cycle at the same time, it is either the normal
    cycling of the system, or it could be that the system is low on
    refrigerant.
     
    Randolph, Jul 11, 2004
    #3
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