clicking noise while stopped

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Mazdaspeed Protege`
It only makes the clicking noise when running my air conditioning. i just bought it 3 months ago, so i dont know much about msp. help please

also the trunk sub doesn't work and i check the fuses, plus the previous owner changed the head unit to a jvc so i don,t know if that matters
 
test the 12v and remote wires on the amp itself. One should read 12v constantly(the larger gauge wire) the other should only read 12v when the radio has power(smaller gauged wire). As for the AC, i would assume it is while the car is idling, right?
 
As for your Sub you say it is not working so i am going to assume that the amp is. The Subs are notorious for failure, so join the MSP club. As for the ticking we are going to need more information. Where is coming from? Open your hood with the AC on, and see if you can pin point the noise. later B
 
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