Yes, if the compressor's bearings are bad, usually accompanied by a roaring or squealing noise coming from the compressor's pulley.
quite possibly the A/C compressor clutch. The whining should decrease when the A/C is turned off. You will still hear some of the noise due to the clutch turning while the engine is on.
when the defroster is turned on, it activates the a/c compressor. the clutch may be locking up on the compressor.
Without the year, make or model of your vehicle it could be a bad compressor and or a bad compressor clutch.............
Start the engine and drive it if possible and get it hot. Then open the hood and watch the fan turning, then turn the engine off and the fan should only turn about 2 times at the most after engine is HOT and then turned off. If it free spins several times then the fan clutch is bad. Replace clutch.
Check the low side pressure switch, the pigtail, the compressor clutch itself and then check to see if you still have an air gap between the hub and the clutch when the system is turned off.........
With the ac off your clutch the outer non belt driven part will not be turning. When it is turned on it will start to spin.
Check the belt and pulleys. Make sure the AC pulley turns. When the AC is turned on, the clutch should engage to the pulley and the AC compressor should turn, and yes, it can cause the engine to vibrate a little. If the clutch doesn't try to engage, there could be some problems with the AC, but first try to find out what caused the noise, and determine if the AC compressor is turning.
The most likely reason the compressor is not coming on is because you are low on freon. The low pressure switch will keep the compressor from cycling on because damage to your compressor would result. You can jumper across the low presure switch with the engine running and A/C turned on, ( for short time only) this will provide you with question is my compressor clutch good, or am I just low on freon. The AC compressor relay switch may need to be replaced
Had the same problem with my 92 cutlass ciera. It turned out to be ac compressor. Probably the clutch.
It is the relay that energizes the clutch on the air conditioning compressor. Yes it does fail and remain closed after ignition is turned off, causing the battery to drain.
Yeh mate sounds as if your clutch plate on the compressor is cactus or burnt out its pretty common problem ull have to replace it
Of course your clutch and/or gearbox are faulty...