I think what she is hearing is the fan clutch engaging and the noise of the rush of air when fan is working. If that is the case, then it sounds like the clutch may have some issues too if the thermostat is ok.
Hope it works out.
Everet <img src="/forums/images/graemlins/patriot.gif" alt="" /> <img src="/forums/images/graemlins/cheers.gif" alt="" /> <img src="/forums/images/graemlins/kewl.gif" alt="" />


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