A compressor is a device that is designed to compress air, refrigerant and other gases under pressure. In an automotive air conditioning system, the compressor is the most important and expensive part. Therefore, its condition must be carefully monitored. How can you check if a compressor is working properly?
Instructions
Step 1
Listen to the sound coming out when the air conditioner is turned off. If the noise comes in the form of a monotonous hum, then at the initial stage of wear, the pulley bearing is making noise. The drive belt can also be overtightened. Then check the belt tension, as well as all the compressor mounting elements and the integrity of the bracket.
Step 2
Check how easily the compressor shaft turns. Turn off the engine and disconnect power to the magnetic clutch. Turn the compressor shaft by hand by the disc hub.
Step 3
Check for microcracks on the mechanical seal and the front compressor shaft seal for refrigerant leaks.
Step 4
Look at the wear on the pulley and pressure plate - it should be even. If it is uneven, then there is a skew of the pulley.
Step 5
Determine if there is abnormal noise while the compressor is running. This will indicate a compressor malfunction. This can happen when refueling or underfilling the system due to unprofessional or untimely maintenance. Also check the condition of the air conditioner fan and the cleanliness level of the condenser - whether it is clogged.
Step 6
Look for dents on the freon line limiting its throughput. Also check the condenser for dents. Please note that the expansion valve must be open. All these factors can lead to disruption of the refrigerant circulation.
Step 7
Pay attention to pressure drops, incl. and insignificant at suction and discharge. Look at the compressor running surface for normal wear and tear. Diagnose the compressor. Determine the serviceability of the compressor valve group. Replace parts if defective.
Step 8
Check for malfunction of the motor-compressor. Remove the cover of the starter relay and the relay itself. Measure the resistance between the casing and the feed-through contacts. Connect the two test leads respectively. If the device does not show an open circuit, but a resistance, then the compressor is faulty.
