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Well the purge valve sounds like a ticking noise coming from my dash, open the hood and it sounds like a very loud tick noise (would of thought it was lifters but we dont have them), but it you hold the hoses it will stop, they say they need to add some oraface to it so it doesnt create a vacuum. Thats just what i was told, i couldnt tell you any thing more then it shouldnt sound that way.
My ac makes a sound much like the sound the bag makes when they bag a patient at the hospital, or one of the breathing machines. Makes it every minute or so. Very strange i think it occurs about the same amount as my old ford truck used to click when i ran the air in it. So i gave up one sound for another.
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