The clutch receives it's signal to engage from a pressure switch in the system.
If there is insufficient refrigerant in the system the pressure switch will not close
resulting in no power at the compressor clutch to make it engage.
AC Compressor clutch relay may be stuck. Remove the relay and see if the clutch releases.
The air conditioning compressor clutch relay is located on the bottom of the air conditioner compressor. The relay switch will be labeled.
thats the relay to engage the a/c compressor clutch
fuse,compressor clutch relay,wiring,system needs recharging,bad compressor
Often this is the connection to the clutch on the compressor.
You may have a bad compressor clutch coil, you need to check the coil and work from there................
The compressor clutch could be for a number of reasons. It could be a defective compressor clutch, it could be a bad low pressure sensor, it could be low refrigerant, it could be a frayed wire on the low pressure sensor. Your fan, assuming you're talking about the blower motor, bad blower motor, bad blower motor resistor, bad relay(s)... those are your culprits.
If the compressor is bad or noisy and the AC clutch is okay try unplugging the AC clutch fuse or relay.
It could be low on coolant. If your vehicle is a 2002-2004 it is probably the magnetic clutch relay as it is a common problem with those years. It is located in the fuse box and a new one runs around $60.
AC clutch relay is inside the fuse case within the engine compartment.
The air conditioning in a Tracer works through the power relay below the air cleaner. The low pressure switch on the accumulator near the firewall and the high pressure switch near the radiator cross member feed signals to a relay in the power relay box under the air cleaner. This relay box then sends information to the A/C compressor clutch. If you can jack up the car, remove the right front wheel and splash shield, you can "back probe" the wires on the A/C clutch and see if they are getting about 13 volts when the engine is running and the A/C is on. If it has the voltage and the compressor is NOT running, the problem is in the compressor. If it doesn't have the 13 volts, the problem is electrical and is wiring, the relay box or one of the switches, including the dash controls. Good luck eliminating these. To be sure, you can run a wire from ground and the battery directly to the compressor clutch to see if it will engage. If it does, the problem is electrical; if it doesn't, the problem is in the compressor.
The WAC relay is a solid state relay usually used to control the air conditioning compressor clutch.