Q&A

Sherry,
It's hard to know if the shop could've caused this without knowing exactly what is wrong and what work the shop performed. I would take it back and ask that they look at the vehicle, a good shop will have a quick look at this and see if it something they may have caused and address it.
Without having enough info, it sounds like a blower fan problem, which isn't related to a timing belt repair.
If the pollen/cabin filter was replaced, that could have an affect on the airflow.

did you have the blower motor checked as I asked in your previous post?

Roy