When air conditioner is turned on, it makes a clicking sound (under the hood)like trying to turn on and off every few seconds.

I had a similar issue on my Nissan sentra years ago. In my case it was the fuel injectors clicking because a diode in the cars computer had failed. It would only stop when I pulled the fuse for the injectors under the hood. You may have a similar issue. On mine it just sounded like a regular clicking under the hood. Very loud with the engine off

Sounds like the clutch on the compresor unit is not working.

When your car is running turn the ac on and check under the hood you should be able to hear a click every few seconds, if you dont then turn off the engine and take the key out.

If it don't click, look for the wire coming from the compresor unit towards the wiring harnes there should be a plug check for corrosion inside the plug.

If it does then go to any auto parts store and locate the ac refill bottles and follow there instructions.

Hope this helped you.

If it does click th

sounds like very low in freon check to see when clicking if compressor clutch is engaging
on and of if so low charged i system usually associated with leak

Listen for fuel pump when turning ignition to on position. If no pump sound, locate fuel pump fuse and relay in box under hood. First check fuse, then listen to relay while ignition is turned to on. Relay should click. If no click, replace relay. If click, circuits are good and pump is likely bad. Please reply if you have questions.

check the fuses 2 relays under hood the a/c compressor may not be engaging, when the a/c comes on you should hear a click at motor @ it will make your engine sound differnt,if your motor is running you can look at the compressor at the center of compressor, that all should be spinning

It sounds to me like its a loose compressor belt that gets hot and stops, have it tightened or replaced if its old and brittle. could also be the compressor going bad,

Hello, It sounds like your hot/cold blend door actuator is either hanging up at times or it's loosing it's calibration range because it's starting to go bad. The ticking noise is most likely the actuator trying to close off the hot air port but is unable to stay closed allowing hot air to mix with the cold. If it's just a weak blend door actuator, it will act up more when the air is on full because it has more resistance due to air flow. If possible try to see if the times it acts up decreases when you start the A/C with low fan speed.

Sounds like there is a vaccum hose off under the hood

It could be the ABS. MY HONDA DOES THE SAME THING.
I took it to PepBoys yesterday and they could not connect to the
computer interface.They said I need to take it to a honda dealer
so they can connect and determine what is wrong with the
Automatic breaking system. The noise is the ABS motor
turning on and off.

needs blower motor