ac or heater

the defrost on the windshield does not work? i put it on the feet and or defrost, only throws out thru the middle vents.

my ac/heater vent does not work. doesn't switch to windshield defogger or to feet. anyone have any idea or a website?

I have a 1997 saturn, 122k miles. I change the oil and generally keep it in good shape. But i've been having this problem recently. Also my engine seems to make a weird noise when I hit around the 25-30mph mark. If i don't let off the gas a little it doesn't accelerate anymore. Once i let off...

...under hood, what is it? I just bought this car from a private party and I just got my oil changed and all fluids replaced so I know it's not that, there are also no indicator lights on.

and every few days it will start blowing again...any ideas why?