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It is low on freon.
low on freon. have an a/c check. most likely there is a leak in the system due to the age of the vehicle.
The clicking sound is your a/c unit trying to engage. I would have freon pressure checked first, if not, a/c unit may be bad
Clicking sound in grand Cherokee can be due to a faultyÊ actuator, or a cracked door. Actuator may causeÊ a clickingÊ sound when one of its plastic gears is broken.
Sound propagate in the form of waves. Waves have energy so they propagate through the medium. Unless you can reflect it back , or damp the sound wave using some or the other way, it is virtually impossible to "stop" a sound in mid air
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either need a blend door accuator or a heater box
particles in the air slow it down and cause it to stop eventually
It sounds very much as if the refrigerant in the system has leaked out. That would account for nothing but hot air. The 'clicking' sound is the A/C compressor relay reacting to a command to turn on the compressor to cool the car. However, there is a built-in safety mechanism that prevents the compressor from running with no refregerant (and burning itself up) and it immediately shuts off. The clicking sound you hear is the electrical relay opening and closing.
Sound is only produced through vibrations. So if there was no air, there would be no sound. In other words, sound needs a medium to travel through, because it needs something to vibrate. The denser the medium, the faster and farther it travels.
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Apparently it is the rear air "blender" ( whatever that is(?)) My 2003 Explorer was making the loud clicking sound from the rear driver side above the rear left wheel. I lived with it for a month before I just found the answer on the net. I turned off the rear fan control (from the front controls) and the clicking has stopped. I guess there is no more air from the rear now but the clicking has stopped- Car is long been paid off and I'm happy again.