What to do to fix cooling unit not starting up but fan blowing on YORK HVAC?

[vstech]

you need to make a few phone calls, and ask for a company with qualified service technicians.
it may very well be that you need to replace the equipment to get a cost effective repair, but you want to KNOW what is causing the problem.
however, from what you've described to me, you have a leaking system that has low pressure safeties locking out the system after it leaks out the refrigerant charge. so you need either a new system properly installed, or you need all leaking components repaired or replaced...

[beenthere]

Sounds like you need a leak check done if they still have to add refrigerant every year. model number of outdoor unit would also help.

[AlKoch]

New technician came out, checked for leak and found levels to be ok, checked and fixed something electrical system and now works again. Thanks everyone.