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Q: Loud noises after I had the head gasket replaced on 2002 Buick Century

I had my head gaskets replaced a couple months ago. Ever since I feel like the car just sounds louder. I don't remember ever really being able to hear the engine when I would accelerate but now I can.

After I got the gaskets replaced it was still a little cold out so I turned the heat on, drove for about an hour and a half straight with no problems. A few hours later I went all the way back home and ran to the store. When I got in my car and started it the heat was already set to on and it sounded REALLY loud, it was kind of like a whirry and buzzy noise I guess would be the best way to describe it. Ever since it only does it sometimes. It's the same thing with the A/C. Could this have anything to do with having my head gaskets replaced? Do you think these two problems are related?
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the blower motor is a separate system. that is one noise. the other noise is a exhaust leak. take it back to the shop and have them properly seal the exhaust.

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