My ac is cold and is basically fine. but the problem is that it doesnt blow hard. it sounds like it is but you barley feel anything. what do i need to replace so it blows hard?

Switch the settings back and forth from floor to face. Is the setting stuck on Defrost?

could be a leaking servo pipe. if it is knob turn type. motor failing on electric type. or a warn linc on vent control. very hard to find out you need to get your hand round the back and feel for the motor/s. on electric type. knob type with engine off move the vent control should hear a hissssing sound if no hissing sound then it is leaking.

Make sure your fan clutch is working. No fan, no cooling of the condenser, no heat dissipation, no cold air. Start the truck and make sure you feel air movement, a lot.

It sounds like you have a blend door issue.Try cycling the air to blow on different parts of the cab ie: defrost,to floor to vent.if you have cold air blowing good on all selections and you know your motor is working on all speeds,then you have a blend door not opening.The control for that is behind the heater/ac control unit.They do go bad from time to time.You can pick up a replacement at either a dealer or a Auto Parts place that sells GM or AC DELCO parts.

While engine running, does the air feel warm to hot blowing through the radiator, if it does water is circulading, if it feels cold, replace thermostat.

sounds like it might be a little low on freon and/or might need the cabin air filter replaced,try replacing the cabin air filter first,its located behind the glove box,hope this helps

you need to go to a autoshop and tell them to recharge the ac. (they put freeon in it,thats the stuff that gets cold)

Check your AC speed resistor. Sounds like its faulty.

your air con needs re gasing

maybe drop the blower motor and check the vents for obstructions. I worked on a friend's car this spring that had a two year-old repair bill sucked in to the blower wheel....it limited the air output but made a lots of noise in the process.