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Have 2007 3.3 and every time I turn the HVAC system on hot or cold I get a slight noise from the engine. Sounds like a pulley bearing. Not sure which pulley it may be. When the system is off there is no noise. Which pulley may be affected by the Hvac system being turned on? Any other cause?
 

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It's usually the pulley on the ac compressor.
I have tested these by turning on the engine and AC, and use a long screwdriver touching one end to the compressor, the other end to your ear. Have someone else turn it off and on.

DISCLAIMER
I AM NOT RESPONSIBLE FOR ANY DAMAGE DONE TO YOUR VEHICLE, ENGINE, OR TO YOURSELF IF THIS TECHNIQUE IS DONE INCORRECTLY. YOU SHOULD HAVE A CERTIFIED MECHANIC TEST IT OUT.
 
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