I have an 11 equinox out of warranty with low miles (salvaged hit in rear. No engine damage.) I have a intermittent clacking or rattle when the heat or ac is on. It seems only to occur when the recirculation or snowflake is lit. . Comes and goes. Sounds harsh outside the car. If the sound appears and i turn ac off it goes away. Some are saying its the timing chain. I already had the cam actuator problem and fixed it myself, but i cant to the chain and tensioner myself .if thats what it is how much would it be?. I lost faith in gm. I had a saturn vue that ate transmissions. Now this... what could it be? Please help! Here is the vid. http://youtu.be/E_7xZWNkk-k
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