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serpentine belts do not stretch as you describe because the tensioner keeps them tight so they just break. It is probably hard and cracking and need s a new one so try that first . The ac has nothing to do with the belt as it will be a low gas problem from leaks and the heat is a coolant problem or a control problem from inside the car.. The grinding sound may be a pulley bearing or some other bearing failing. Why don't you take it to a repair shop to find all the faults so that you can work out how much it is going to cost.
replace the failing drive belt and make sure it is tensioned correctly
the noise is from a slipping belt and the battery problem is because the alternator is not charging because of the drive belt problem
Have you checked the belt for cracks? Also, you never want to use the spray on the belt. If the belt is new, then you want to check the pulleys for dirt or old rubber that melted to the pulley. A good way to clean the pulleys is to remove the belt and use soapy water and a tooth brush and clean each pulley. If you are having a hard time getting all the junk off, you could try using a pick or a screwdriver and CAREFULLY pressing it against each pulley until they are clean. If that doesn't work then you could either have a misalignment of pulleys, wrong belt, or possibly fluids leaking on belt.
Has anyone thought it might be the clutch release bearing? This is of course inside the bell housing, between the engine and transmission.
For a long time before the bearing goes completely out and need replacing, it could start squealing like that. It is a sealed bearing, but when old the internal grease may dissipate, and cause squealing.
To address your first problem squeaking brakes aka "brake squeal", is most often casued by one or 2 things: "Pad vibration" or a "low brake warning sensor".
Pad vibation is usually caused by ineffective pad anti-rattling clips & hardware that allow the pads to vibrate at a super fast speed whenever the brakes are applied, thus causing a high pitch brake squeal. To correct this, replace all the pad hardware and anti-rattling clips and make sure you use a quality pad set that has anti-rattling plates attached to the backs of them. Weather conditions do affect brake squeal, that is why it seems to be worse at times.
Low brake warning sensor squeal occurs when your brake pads reach the point of replacement, the sensor attached to the pads scrapes on the rotor which produces a high pitch squealing sound to warn you it's time for new pads.
As far as your second problem goes (a knocking sound), I'll need more information about the problem before I can offer a possible cause (eg. happens on left or right turns, while going over bumps, at high or low speeds, accellerating...).
Thats what it sounds like. That would cause all your problems. You could start the jeep and then take your hot side battery terminal off. If it dies asap, your alternator is bad. Hope this helps. Best of luck.
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