Posts Tagged: compressor control solenoid

How To Diagnose a Variable Displacement AC Compressor

Variable Displacement AC Compressor Problems and Fixes Quick Summary A variable displacement AC compressor adjusts cooling by varying the piston stroke, not by cycling the clutch on and off. In other words, this clutchless compressor runs all the time and “de-strokes” when cooling isn’t needed. The compressor control valve regulates the piston stroke length. The valve is a pulse-width-modulated (PWM) solenoid that allows or restricts refrigerant flow to the advance or retard side of the swash plate. The pulse width is determined by the HVAC control head based on the … Read More