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Re: compressor comes on but no cool air has freion and...
Your vehicle has the R-134 system. These systems usually don't have a charge site glass window. Just because the compressor turns doesn't mean the system is full. You need to hook up the hi and lo side of the system to evaluate the systems operation. Too much R134 will adversely affect the performance of the system producing warm air. You could have a bad expansion valve contributing to the systems malfunction. You can find the problem by hooking system to a set of manifold gages.
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Check that the heater is turning off as the hot air will over come the cool air. Check that the clutch on the a/c pulley is still engaging as it the unit was over filled or has a leak from a badly fitted pipe the high low switch will not allow the compressor to work.. If the work was done professionally check that the correct gas was used and seek warranty for the problem.
If the air-con working ok and full of gas it will be cold and the compressor clutch does click on and off. You say slow or weak air through vents. When was the last time the pollen filter was changed as heater motor air may be restricted by this if dirty or heater motor performance poor.
The heater and A/C have one thing in common, the blower motor. The heater is controlled by a vacuum system. The heater control is on the right (passanger) side under the hood. The heater control opens a water valve by vacuum. If the blower motor is blowing air and the heater is not working, this could be the cause. Note that the cooling system must be full of coolant for this system to work.
The A/C system is controlled during the defrost cycle and the A/C cycle. It sounds that you may have an air circulation problem if both the heater and A/C is not working properly. Again, if the vents are blowing out good air flow, there are other problems. If there is a freon problem, the A/C compressor will cycle on and off quickly and there will not be much cool air.
Hope this helps and please post more information about your problem for us to help.
Check your antifreeze level and if low then add antifreeze until the radiator is full and the overflow tank is up to the correct level. that should solve your problem. If it isn't that, chances are your thermostat could be stuck open which isn't allowing the coolant to warm up properly.
Blower motor resistor is most common ($20-$70) it controls the blower motor fan and speeds or fan relay fuse (usually under the hood) If it's not either then the blower itself is bad. You can pull the motor and apply 12volts to it to test, if it spins then the resistor.