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Hi,
I've experienced the pulsating in many brands/models of cars which allow the rear windows to open fully. You can stop the pulse by also opening a front window. When driving slow I like to run with both front windows full open, both back windows full closed. When faster, I open the front and rear of one side (usually driver, but sometimes passenger) about 2 inches, and keep the other side closed. This sets up a nice swirling pattern in the air that does a good job of keeping me cool without A/C if the outside temp. is under about 83F. Over that, I turn on the A/C and set the thermostat to 79 or 80 (or 74 if my wife's in the car).
 
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