Want this question answered?
Air conditioning compressors that sit unused for a long time or run low on oil may lock up. The moving parts in the compressor motor will become tight and hard to move.
The air conditioner compressor is made of several parts that need to move to circulate the refrigerant through the system. There is the pully, shaft, bearings and lifters or pistons inside of the compressor, the compressor motor has a clutch. When the belt on the engine turns it turns the shaft on the compressor which is held in place by bearings, the shaft moves the lifters to circulate the refrigerant - the most likely cause for a compressor to lock up is missing or misaligned bearings. Other possible causes, belt loose or not on properly, shaft bent, compressor motor not working correctly or clutch worn, pully stuck. Generally you would have to replace the ac because of how the serpentine belt is threaded onto the engine. Check to see if you can bypass the pully by getting a smaller belt, but it is important that the belt be threaded right for all the other engine parts to move correctly. The ac compressor usually runs about 2 - 4 hundred dollars new. You can also get rebuilt ones or go to a reputable junk yard for a replacement one.
To take the lock plate off requires a lock plate spring compressor. With the spring compressor in place and the spring slightly compressed remove the circlip that holds the lock plate on. Then release the spring compressor and the lock plate simply slides off.
Compressor locked rotor amps are measured with an amp-probe or clip on ampmeter. Lock rotor amps are amps with the rotor not turning/moving, and the winding at ambient temperature. locked rotor amps are X4.5 to X5 times the FLA of motor name plate.
This seems to be a common failure. The lock and lock motor assembly need to be replaced. I'm working on the same problem on my 2000 focus right now. I'm trying to get the lock cylinder of from the old lock/motor assembly. Any advice?
No, only the compressor will lock up.
what causes compressor lockout in voager rooftop unit.
Use a spring compressor to push the lock plate down slightly, then remove the circlip that keeps the plate on. Release the spring compressor and the lock plate will come off. Reverse the procedure to reinstall.
Bleed off some of the refrigerant to get the system pressure down, then wait a while until any liquid refrigerant in the compressor has time to leak into the refrigerant loop. It may take a few minutes; since the compressor valves seal imperfectly, pressures will eventually equalize and it should be possible to start up the compressor again.
doors locks & trunk lock not working
The anti-lock brake system in some vehicles can malfunction and cause an your motor to lock up.
If the fan outside is not running the compressor will overheat and if the fan inside the house is not running the compressor will get liquid refrigerant back to it and lock up! Neither is good for the compressor.