a variable wobble plate type compressor with a variable angle non - rotary wobble plate , having a suction chamber for a refrigerant before compression , a discharge chamber for a compressed refrigerant , compressing cylinder bores , pistons reciprocated by the wobble plate within the cylinder bores for compressing the refrigerant , a crankcase having a chamber to receive therein a drive and a wobble plate mechanism , connected to the pistons to cause the reciprocating motion of the pistons and capable of changing the wobble angle thereof , a first passageway closably opened so as to apply a high discharge gas pressure of the discharge chamber to the drive and wobble plate mechanism within the crankcase chamber , a solenoid valve for closing and opening the first passageway in response to a change in a cooling load , and a second passageway providing a fluid communication between the crankcase chamber and the suction chamber , a spool valve urged by a spring toward a first position opening the second passageway thereby permitting evacuation of a high pressure gas from the crankcase chamber to the suction chamber while the solenoid valve is closing the first passageway , and moved toward a second position closing the second passageway in association with the operation of the solenoid valve for opening the first passageway .