1996 Caravan Sport

I have a 1996 dodge caravan sport. 3.3 ltr. My problems with it are....
the air blows but its hot! put in freon and with in a day or 2 its hot again. when i put it in gear or idle it makes a lot of noise. like rattling, popping, rumble..like something is lose under the hood and the passenger window wont come down...power windows. I am in desperate need of some HELP..I have a 3 yr old and one on the way..i need air....and a good van...also have a 10 yr old and i just bought this van yesterday..i also have a kia but thats a whole different story...!!! please can someone help me and tell me what i can do..or where to atleast start.

I forgot to post that it also when i turn the headlights on at night the gear shift and the odometer lights blink at me. but only when i turn on the headlights! why? it is very distracting! DID I MENTION I ONLY PAID 1,200 FOR IT..LOL

as far as the air conditioning you need to have someone find the leak and repair it. this is usually done when you go for a.c. work but apparently in your case it wasnt. they put a dye in system and see where the leak is otherwise the freon is just going back into atmosphere.