System is equipped with a cycling clutch system that uses an
expansion valve in refrigerant line between condenser and evaporator,
near condenser. System is engaged when A/C switch on control panel is
pressed. See Fig. 1. Pressure switch on accumulator cycles compressor
clutch on and off. Blower fan speed is controlled by sliding switch on
lower left of A/C-heater control panel.
Airflow modes are controlled by center knob on A/C-heater
control panel. Mode doors are controlled by cables on left side of
climate control unit. See Fig. 2. Temperature blend (air mix) doors,
located on driver and passenger side respectively, is selected by left
or right knob on A/C-heater control panel. Doors are controlled by
cables on left side and center of climate control unit.
Fresh/recirculated air is selected by switch to lower right
of mode knob on A/C-heater control panel. Door is controlled by
recirculation motor on upper half of climate control unit. Air
conditioning system will only operate above 32 F (0 C). Blower switch
must be in position "1" or higher to engage compressor.
A/C compressor is connected in series with the low-pressure
switch, high-pressure switch, and safety switch. The high-pressure and
safety switch cut power to the A/C compressor if pressure in the A/C
high-pressure circuit becomes excessive, supplying a signal to ECM to
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