If you see battery voltage on the compressor clutch connector, then the problem is in the clutch itself. If you’re not getting battery voltage at the connector, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. The clutch coil ground is internal to the compressor NOTE: Some vehicles only have a power wire going to the clutch coil. With engine running and the AC set to MAX, use a digital voltmeter to check for battery voltage and good ground at the connector. Move it away from moving parts so you can safely check for power and ground. If the fuse is good, disconnect the electrical connector from the compressor clutch coil. In a computer controlled system, the compressor clutch relay is grounded by the computer. In both of these scenarios, you’d start the diagnosis by checking the compressor clutch fuse. The control coil energizes and closes the relay contacts to provide power to the AC compressor clutch coil. The PCM/ECM monitors the low and high pressure switches and if the pressures are withing spec, the PCM/ECM provides ground to the AC compressor clutch relay control coil. When the low pressure switch sees refrigerant pressure above the low pressure limit, it closes a switch to complete ground to the AC compressor clutch control coil. AC clutch not getting powerĪn AC compressor clutch relay can switch power in a number of ways. If the clutch doesn’t engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, a low pressure switch lockout, or even a bad engine coolant temperature switch. If only the pulley is turning, but the clutch disc isn’t, there’s a problem somewhere in the system. That means the clutch has properly engaged with the pulley. Both the pulley and the clutch should be spinning. Then look at the front of the compressor clutch. Turn the air conditioning controls to MAX AC and start the engine. The three components of a car’s air conditioning compressor clutch When the AC is turned on, power flows to the clutch coil, creating an elector-magnet that pulls the clutch plate against the pulley, which drives the compressor shaft. The pulley spins the entire time the engine is running, but the clutch plate is stationary when the AC is off. Older vehicles have a clutch type compressor. When the AC isn’t on, the wobble plate inside the compressor is in the 0° position, so the compressor isn’t compressing any refrigerant. The pulley drives the compressor the entire time the engine is running. Late model vehicles use a clutch-less variable displacement AC compressor. Before you start, know the difference between a clutch type AC compressor and a clutch-less compressor
03 MAZDA PROTEGE 5 AC LOW PRESSURE BYPASS HOW TO
After reading, go to this post to learn how to diagnose a compressor clutch problem.
03 MAZDA PROTEGE 5 AC LOW PRESSURE BYPASS FULL
This is a full explanation of how the system works. If so, try the troubleshooting techniques described here. If you’re here, chances are you’ve tried to recharge your AC system and found a compressor clutch not engaging issue. Repair Topics > Air Conditioning Symptoms and Repair > Compressor Clutch > Compressor clutch not engaging Compressor clutch not engaging Car air conditioner compressor clutch not engaging
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