Get guys. I have a ticking sound coming from my truck sounds like it's in the area of the ac compressor. Is it a common problem on them? It has 120000 miles. Hoping that's all it is

 

Does it make any difference if you turn of the AC?
Is it a loud ticking or more like a relay kind of ticking (Thinking of the sound from the injectors)

 

Bad idler/tensioner pulley?

 

My AC compressor is actually knocking. It's probably not long for life. Aside from that, the engine does have a tick. I'm led to believe it's either the timing chain tensioner or a wrist pin out of tolerance. Either way, It's been 16,000 miles and I haven't had a single issue since I bought the truck.

 

Worn timing chain guides or tensioner is clogged,chains are stretched,try removing valve cover and check the play on chains.

 

Water pump is about to go out. I had a noise and someone said it was a pulley, I didn't know what it was, and the first cold day my truck started making a crazy loud squeezing noise and then the ticking noise quit altogether. I then drove to the bank amd my truck started overheating. The impeller on my waterpump had cracked and was not turning with the shaft. So if I was you I would take off the water pump and check the impeller ( round plastic thing that tuns the water)

 

Also when I turned the ac compressor on the noise would get worse, I that's the case for you, it's most certainly the wAterpump.