Fan how hard should it blow?

[WHYBYNU]

I was running my air conditioning today in my 71 Super and it just doesn't seem to blow very hard. Its a stock unit and the air is very cold. If you put the fan switch on high ( all the way down ) it won't blow at all. I run the air more just to run it than I do
because of heat ( Ontario,NY doesn't get that hot ) Just wondering if this normal or is the fan switch bad? I know it is'nt going to freeze me out of the truck but I would like it to blow alittle harder. I had a 69 short step w/a 250 straight 6 in it, my father bought new in 69 and it had factory air it was the only straight 6 I've ever seen with factory air it had 3 on the tree no power steering or brakes just air. Sorry to ramble just a slow day at work.