SOURCE: 97 Olds Aurora AC blowing warm air a day after recharging system
Several- The system should hold freon for years without leaking. There are pressure switches and they cut off the compressor with an undercharge and an overcharge. You need guages to measure the charge. There are testers the A/C shops have called "sniffers" which can detect a leak. If you have no leak then you need a technician to add or remove freon to get the concentration right. Or you need guages.
SOURCE: ac not working, blows hot air only. Recharged
Check the evaporator coil by sniffing the vents,floor is best, with your tester.
SOURCE: ac not working on 2004 s430
If you have the hood up stand outside while someone activates your air off and on and see if the clutch on the compressor goes on and off while they activate the switch. If that isn't it the it could be improperly charged system or your climate control door that opens and closes for hot or air is not working properly and only stays on heat.
SOURCE: 1999 volkswagen beetle ... a/c won't blow cold
check freon if it is full charge ,check auxiliary fan , if this two condition is good ,you need to replace expansion valve and filter drier
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