You'll hear an annoying squeal. Maybe eventually the battery might die on you if the belt is slipping enough. Much of it depends on what the belt is actually driving which is probably more than the fan.
Glazed or loose fan belt?
check tension on fan belt(s)
rub soap on the belt
Loose or glazed fan belt?
the squeeling noise is from the fan belt either the belt needs renewing, or the a/c compressor clutch is not operating correctly
Your AC may be squealing due to a worn-out or loose fan belt. To fix it, you can try tightening or replacing the fan belt. If the issue persists, it's best to consult a professional HVAC technician for further inspection and repair.
Could also be the belt tensioner ...
loose or glazed fan belt.
It sounds like the fan-belt is slipping.
depending on how low it is, it is either the fan rubbing against the casing or the belt that turns the fan coming loose.
Your AC unit may be squealing due to a worn-out or loose fan belt, which can cause friction and noise. To fix it, you can try tightening or replacing the fan belt. If the issue persists, it's best to contact a professional HVAC technician for further inspection and repair.
Your air conditioner may be squealing due to a worn-out fan belt or a malfunctioning motor. To fix it, you can try tightening or replacing the fan belt, or lubricating the motor. If the issue persists, it's best to contact a professional HVAC technician for further inspection and repair.