Need to know howmany cans to use to charge the feone inmy airconditioning 2001 gran am 4cyclinder

You need a set of AC gauges like these. About $60.00

it is charged WITH freon. there is a sticker under the hood that tells you the capacity of the system - R134A

check blend door for proper operation proply broken gears or door stuck its located on heater case.

You can buy a recharge kit at your local parts store. The kit comes with a pressure gauge to let you know when the coolant level is good, over charged, or low. The kit cost about $25. With the kit hook up, it can't be hooked up wrong with the high and low pressure ends. You will be able to use this over and over, just buy new cans when you need to refill.

Did you just fill the freon? Have you tried unhooking the battery to reset the system?

You will need to buy the no a/c belt most likely. Check the diagram in the engine compartment.

Look in the engine bay fuse box and see a square blue relay .swop it with one by it and try again if its ok you need new blue charging relay.

Its job is to cut the aircon relay off if the cars not charging so you dont get a flat battery but they go wrong.

Head needs to be "step torqued" first round is at 22 foot pounds, second is at 45 foot pounds, third is 100 foot pounds at passenger side front corner, 100 at all others. sequence is: passenger side: front to rear: 8,4,1,5,9
Drivers side: 7,3,2,6,10 Tighten in numerical order (1,2,3,4, etc).

look for the air dryer,black circular container with a plug on the side,if you take that switch out you will loose the feon

check fuse; have feon checked