Posts Tagged: car AC electrical diagnosis
The Right Way to Troubleshoot Auto AC Electrical Issues
Modern Car AC Problems Explained (Electrical vs Refrigerant) Quick Summary • When you troubleshoot auto AC electrical issues, start with a scan tool—not gauges • Modern AC systems are computer-controlled, not just refrigerant-based • Faulty sensors, actuators, or network communication often mimic low refrigerant • Always verify power, ground, and feedback signals before replacing parts • The system can only act on what it sees—bad data = bad cooling Can Electrical Problems Cause Your Car’s AC to Stop Cooling? Yes—and in today’s vehicles, electrical problems are one of the most … Read More
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