How do I check my ac compressor? it is not

In a 1994 Chevy K1500, the compressor should receive power when the AC button is turned on, assuming that the system is adequately pressurized and there are no other issues preventing it from engaging. Here are some steps to diagnose the issue:

1. Check Refrigerant Levels: Low refrigerant levels can prevent the AC compressor from engaging. If your system is low on refrigerant, it may need to be recharged. This is typically a job for a qualified technician.
2. Check for Refrigerant Leaks: If your system is low on refrigerant, it's essential to check for leaks. A leak can cause the refrigerant to escape and prevent the compressor from engaging. Look for signs of oil or refrigerant leaks around the AC components.
3. Fuse and Relay Inspection: Ensure that the AC system's fuse and relay are functioning correctly. You can consult your vehicle's owner's manual or a fuse box diagram to locate the relevant fuses and relays. Replace any blown fuses or faulty relays.
4. Check the Pressure Switch: Many vehicles have a high-pressure and low-pressure switch in the AC system. These switches monitor the pressure in the system and can prevent the compressor from engaging if the pressure is too high or too low. Check these switches for proper operation and continuity.
5. Inspect Wiring and Connectors: Examine the wiring and connectors leading to the AC compressor. Look for damaged wires, loose connections, or corrosion. Ensure that there is no damage to the wiring harness.
6. AC Clutch and Compressor: If all the electrical components are working correctly, you may need to inspect the AC clutch and compressor itself. The AC clutch should engage and disengage when the AC is turned on and off. If the clutch isn't engaging, it may be faulty, or there could be an issue with the compressor itself.
7. Refrigerant Pressure Sensors: Some vehicles are equipped with refrigerant pressure sensors that can prevent the compressor from engaging if the pressure is out of the specified range. Check if your vehicle has such sensors and test them if necessary.
8. Professional Diagnosis: If you've checked all of the above and cannot identify the issue, or if you're uncomfortable working on AC systems, it's recommended to consult a qualified automotive technician or AC specialist for a thorough diagnosis and repair.

Remember to prioritize safety when working on your vehicle's AC system, as it involves high-pressure refrigerant and electrical components. If you're not experienced in automotive AC repairs, it's best to seek professional assistance to avoid injury or damage to your vehicle.

disconnect the wire at the compressor to check that the clutch is releasing,then with a test light check to see if power is present when it is switched on and no power when off.

Your compressor could be faulty. Check to see if it engages when you press the AC button with the car running.

1. Check if air blows with the fan setting turned to high.
2. Check that the radiator cooling fan engages when the A/C button is pressed.
3. Locate the compressor.
4. Turn on the A/C.
5. Check if the compressor's clutch has been engaged.
6. If the clutch engages, the fault is elsewhere.
7. If the clutch does not engage, check for power to the clutch.

These steps might help find the problem.

first thing check AC compressor fuse.the AC compressor clutch should engage when you turn on airconditioner if AC compressor dont come on and fuse okay compressor clutch is open or low on refrigerant you need check your AC refrigerant low pressure side and high pressure side need a manifold gauge set. best let garage check out AC system could need system recharged or could have leak in the system.

The compressor is not turning due to the clutch is not engaged. The clutch is only engaged after a total check from the controller then a signal is generated to turn on the clutch. This is a series of sensor check to meet the requirement. It means you have to check: The refrigerant pressure switch check to make sure there is enogh coolant, The coolant sensor -if it signal too hot, clutch not engaged, The speed sensor from the back of compressor to compare the speed of of the camshaft to prevent the compressor looked up, The sensor at the evaporator, if it is bad, it senses too cold then the clutch will not engage, The sensor near the reading lights to check cabin temperature... All these make the AC repair for this car is expensive, and not any one can fix the AC in this kind of car. Don't try to find any local repairman to attempt the fix, since it ends up costing you more than what it needs to be. Good luck.

Locate wires coming from compressor clutch and trace to nearest plug that you can unplug. Turn on A/C to max cooling. If clutch not engaged (center of compressor drive pulley not spinning with pulley), unplug compressor clutch wires and use multimeter to check voltage going to compressor clutch. If voltage is around 12 volts or more, then clutch should be engaged when plugged in. Plug clutch wires back in (with motor still running and ac set to max). If clutch still not engaged, then clutch definitely bad because 12V signal should engage it.

pls. check your ac compressor magnetic clutch attached in front of ur compressor if its working/ ac clutch engage when u turn the ac switch on and disengage when u turn the ac switch off/ it normally makes a clacking sound when it engage with the rotation of ur compressor/ if its not engaging it means ur magnetic clutch is stuck up giving excessive load to ur engine thats why it overheats/ it smell burnt because its magnetic coil is fried/ or check cooling system of ur car might be that coolant is empty/ fan is not working/ radiator is clogged or thermostatic valve is stuck blocking coolant flow....

I would take it back to whoever replaced the module however, if you want to check for the problem yourself, Look for the AC compressor. with the AC turned off have someone start the vehicle, while watching the AC compressor have the person in the vehicle turn the AC on. If the clutch engages then you have lost your freon charge and need to have the AC unit serviced. If it does not start turn the engine off and check all the wiring connections going to the AC compressor. If all the connections are good start the vehicle, and have the person in the vehicle turn the control to cold and turn on the defroster. If the AC clutch engages then you have a bad ECM module or mis-programmed ECM take it back to be Properly programmed and repaired. If the clutch does not engage it is possible the AC compressor is bad. Take the vehicle to the Mechanic to have teh AC system checked to see why it is not engaging.

You must of lost freon and when there is no freon your clutch will not activate.Must check it for pressure in the lines.If there is pressure check pressure switch.Good luck let me know