Originally Posted by GeorgeLG

You may have a power distribution problem to the AC compressor relay. That relay is in the underhood fuse box and has four terminals. Two of the terminals are for the relay coil that controls the relay function. The other two terminals are for the power that is being controlled by the relay contacts, in this case it's power for your compressor clutch. When the ignition switch/key is in the run position there must be 12v power to one of the relay coil terminals and 12v power to one of the relay power/contact terminals. Please confirm that you only have 12v power to one of the four relay terminals. If this is the case then we have to find the power distribution problem. If you do have 12v at two relay terminals then we will find out why your compressor clutch does not get 12v power.

Do not put a can of 134a into your system if you do not know if the refrigerant charge is low. This can damage your system or at least confuse this problem by now causing your high pressure switch to shut the system off. The refrigerant does not lubricate the system, the oil in the system lubricates the system. Very little of the oil is lost when the refrigerant charge is low. The refrigerant does help cool the compressor so it does run hotter when the charge is low and eventually there can be an oil problem if the charge is low but the compressor holds oil internally. Forcing the compressor to run for short periods to diagnose a problem should not cause any issues. Now if the system had an instant purge of the entire charge then yes a lot of the oil can be lost. The fact that a small amount of oil leaks out with the refrigerant is one of your best tools for finding a leak because the area will be slightly greasy feeling and attracting dirt.

George

Originally Posted by jimmy_for_ever

Thank you George I fix the problem and its cause by relay wire was cut out but the problem now how I open the underhood fuse block box