Ensure the engine is off and completely cooled down.
Open the hood of the Mustang.
Locate the serpentine belt, which is the long, thin belt that runs around the front of the engine, connecting various pulleys.
Check the belt for any cracks, fraying, or glazing, which are all signs of wear and can cause the belt to squeal.
Inspect the pulleys that the belt runs around, looking for any signs of damage or misalignment.
Use a piece of chalk to mark the backside of the belt near where the noise is coming from. Start the engine and watch the chalk mark as the belt moves. If it rubs against something, you'll notice the chalk mark being erased or smudged. This will help you narrow down the source of the squeal.
If the belt or pulleys appear damaged or misaligned, it's best to have the vehicle inspected and repaired by a professional mechanic to avoid further damage.
If you are not comfortable performing these checks or lack the necessary tools, it is advisable to take the vehicle to a trusted mechanic or automotive repair shop for proper inspection and diagnosis.
