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Noise when turning on cabin heat after annual

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Joined
Dec 8, 2012
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Just out of annual and when I turn on cabin heat, defrost or heat, I am hearing some type of noise possibly from the engine area but am not sure of that. Will be contacting the shop about it tomorrow but am wondering if anyone has any ideas. This was not occurring before the annual.

It is hard to tell what it really is but I can hear it in cruise over the noise cancelation of the Bose. Also at idle on the ground I can hear it as well. It is hard to describe the noise but it goes away when heat is turned off.
 

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