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Tap the front of the A/C compressor and see if it engages, if it does the spacing in the magnetic pickup is off. If it doesn't then you have a bad switch either high side or low side of the compressor lines.
There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse. Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging. If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad. Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on, Hope this helps let me know what the outcome is. Good day. I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals
Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck
Check the connections on the plug going to the compressor clutch and on the pressure switch on the low side. Also check the gap on the clutch. It may be too wide after where to engage correctly. Good luck.
The first thing to check is if there is enough gas. The compressor will not work when the gas is low. There is a small inspection glass on the line. This needs to be clear. If you see streaks or bubbles means the gas is low. Never mind the pressure or wiring for now, Add one can of gas and this should get that first part done.
Best bet is to recharge the system, and check your fuse blocks. You can purchase a recharge kit for approx. $30. Ensure that your fuses are good, and check the wiring for a short.
check the low side switch located on the ac receiver drier for 12 volts if so jump it with a paper clip if the compressor comes on then the relay is good if not the relay is in the fuse junction box under the hood.Most likely the pressure sensor.
two things stop the compressor from engaging,
A bad relay and the low coolant switch. Sometimes to recharge the system you need to jump the low coolant switch. Good luck
There is also a low pressure switch that is incorporated into your AC system. If you have lost to much R-134 the compressor will not engage. This is to protect the compressor so it does not seize up from lack of oil. Your AC system also has ester oil in the system to lubricate the O rings and seals to keep them soft so they seal. You can jump the pressure switch to override the low pressure. If the clutch on the compressor engages then you have a low charge in your system. Or, you can place a manifold gage set on the low and hi side of the system to see what pressures you are running. If you don't know anything about head pressures then don't attempt this process. Good luck.
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