The AC compressor does not have to be running to charge the AC system, and the low pressure switch will even prevent the AC compressor from operating until there is sufficient pressure to operate the AC compressor without damaging it.
Start the engine and turn on the AC, then charge the system with the R-134a and as soon as there is enough pressure built up to trip the low pressure switch off, the AC compressor clutch should then engage and then finish charging the AC system.
SOURCE: 1999 gmc Jimmy only Blows hot air. Diverter
When recharging the ac you need to recover the old refridgerent. That means you have to take out all the old 134 and replace with new 134. On the engine sticker under the hood should tell you how many pounds of 134 it takes. When put in the 134 make sure your ac is on high.
SOURCE: Have a 1986 F-350 A/C puts out cool air but not
in 1986 it is r12 but you can convert to r134 which is a ton cheaper than paying for r12 you need a license to buy r12 r134 is right on the shelf at auto zone they also sell retro fit kits with everything you need to convert your system and they work very well
Testimonial: "Thanks for your responce real helpful"
SOURCE: I put a can of 134a it seemed to help but still
1) get a gauge to check on the low side pressure when adding refrigerant to see if it's too low or too high.
2) if in the proper range check again in a few days to see if the pressure is holding and you don't have a leak that requires a teardown & repair.
3) the fact that the compressor (clutch) IS engaging and disengaging suggests that that part of your system is working ok. IF you can get normal refrigerant levels then you can start troubleshooting the fast cycling.
4) and online manual here:
http://myweb.dal.ca/is353832/93fsm/airconditioning.html
SOURCE: 2001 galant Air conditioner Blows
I believe the freon type is correct. Check the pressure of the freon if it decreased. The AC setting should be at high the same with the fan when measuring and recharging. Check if you get the clicking sound in the engine bay when you have the AC turned on. If not it could be the relay in the relay box that may have gone bad. The problem may also be not related to the freon level or the compressor but the evaporator. With the year of the car you may want to inspect the evaporator which is found underneath the dashboard at the driver side. You may just need to have it cleaned.
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