Heater blower

thought I'd start here before bringing it in to get checked out!!!

I have a 2014 TL. It was parked outside from Wednesday until Sunday and it was mighty cold out for most of that time. I was happy that it started with no hesitation yesterday and I drove it straight into the garage to warm up. Now today it seems like the heater blower isn't blowing as much air as it used to. It still works, but not as hard.

Any thoughts or ideas on what the issue might be?

thanks