First clue would be a HOT house.
It is important to know the signs of a bad car part. If an AC clutch bearing going bad, the biggest indication would be the trouble driving with the AC on in the car.
Turn on ac and watch clutch on front of ac compressor. If clutch doesn't engage then AC relay is bad. Or you can follow the schematic on the side of the relay and use a volt meter to test it.
In the central ac system it could be a few diffrent things that are not working, that is causing the fan not to blow. Their could be no power to the outside unit, a bad contactor, a bad capacitor, or your high pressure switch could be shut down.
how do you check freon on central ac and what should the guages read.
You have to know what the problem is, before you can know the cost. Low Freon? $100. Bad AC compressor $5/600.Condenser, evaporator, hoses?
can a faluty thermostat affect your central ac working?
One way to tell if you're low on coolant on a central AC unit is to feel the air coming out of the vents. If the air is warm or room temperature, it is a sign that you are low on coolant.
i don't know that much
If you have checked and the blower motor has both power and ground then the motor is bad.........
Check for a blown fuse in fuse block and also at the top of the compressor Bad switch Bad compressor clutch
They can get noisy and leak oil. You want to replace a noisy ac compressor before it fills the system with metal trash.
How can I know with no more information than this? Seek out professional help.