Chevrolet Repair: Adding Freon, 1998 chevy prizm, chevy prizm

Question
I can't get the freon to go into the A/C System on my 1998 Chevy Prizm. I start the car, turn the A/C to MAX(the compressor is spinning), I have the freon hooked up to the the low side but when I pull on the trigger to release the freon into the system it doesn't do anything. Any ideas? Thanks.

Answer
Hi John.... i am not sure what system you are using but when you pull the trigger is it opening the can...also on most of those types of self fill systems the can should be upside down when you do... if thats not the problem is the compressor engauging, does clutch activate...if not check power to the compressor, also check that clutch is not burned out and can't pump...if pump is really low it may not come on. try energising the pump with 12 volts direct...hope this helps