GMC chevrolet camaro 2000 Service Manual page 193

1-96 Heating, Ventilation and Air Conditioning HVAC
(5) Clutch Rotor Bearing
(6) Clutch Rotor
(7) Cluch Coil
(8) Compressor Shaft Seal and Snap Ring
(9) Compressor Control Valve
(10) Compressor Control Valve Retaing Ring
The V7 compressor is a variable displacement
compressor that can match the automotive air
conditioning demand under all conditions without
cycling. The basic compressor mechanism is a variable
angle wobble~plate with seven axially oriented
cylinders. A bellows actuated control valve located in
the rear head of the compressor senses the
compressor suction pressure and is the center of
control for the compressor displacement. The
crankcase-suction differential controls both the
wobble-plate and the compressor displacement. When
the A/C capacity demand is high, the suction
pressure will be above the control point. The control
valve will maintain a bleed from crankcase to
suction which causes no crankcase-suction pressure
differential giving the compressor maximum
displacement.
(11) Compressor
(12) Pressure Relief Valve
(13) Suction Port Screen
(14) Special R-134a Suction Port
(15) Seal Washers
(16) Special R-134a Discharge Port
When the A/C capacity demand is lower and the
suction pressure reaches the control point, the valve
will bleed discharge gas into the crankcase and
close of a passage from the crankcase
to
the suction
plenum. The wobble-plate angle is controlled by a
force balance on the seven pistons. A slight increase
in the crankcase-suction pressure differential
creates a force on the pistons. This results in a
movement of the wobble-plate pivot pin that reduces
the plate angle.
The compressor has a unique lubrication system.
The crankcase-suction bleed is routed through
the rotating wobble-plate for lubrication of the
wobble-plate bearing. The rotation acts an oil
separator, removing some of the oil from the
crankcase-suction bleed, and rerouting the oil to the
crankcase where the oil can lubricate the compressor .
mechanism.
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