Air is not blowing

My 91 integra is not blowing air enough I have no a/c.
And if I put the air on high it dims my dashboard lights by it still nearly blows anything. Could it be the fan??

Could be your alternator. If your alt isn’t producing enough current, your bloeer motor won’t work right.

I just replace my alternator a mounts ago and it’s been like since I’ve got the car idk why?

Is the fan speed increasing as normal? If so you might have to pull out the evap core and clean it out. My da had so much stuff clogged in it the air wouldnt blow through. Its the black box next to the blower motor btw.

Is that as easy done as said?