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.
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I notice when I turn the AC on the compressor does not run. No noises at all. Just warm air from the fan being on.
Turns out there was a hole in a hose. The mechanic is also telling me I have to replace the dryer because it has been "open" due to the hole in that hose. Would this be accurate?
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