Connect the nozzle and hold the canister at a 3 o'clock angle.

Warning: Keep an eye on the PSI level. It should stay between 30 and 50, as going beyond 50 psi could cause the car's compressor to become damaged.

Lock and remove the canister if it is around 40 to prevent it from going to 50 psi.

Finally, start up the car. If the air conditioning is cooler, you'll know that it works!