* Power Steering Pump: This is a common culprit for squealing noises. Check the pump itself for leaks or worn seals. A low power steering fluid level can also cause squealing. Top off the fluid and check for leaks.
* Tensioner Pulley: While you replaced the idler pulley, the tensioner pulley is responsible for keeping the belt taut. It might be failing even if it looks okay. A bearing inside the tensioner pulley can wear out and squeal.
* Belt Alignment: Even with a new belt, if the belt isn't properly aligned on all the pulleys, it can squeal. Make sure it's tracking correctly across all pulleys.
* Damaged Pulley Grooves: Inspect the grooves on *all* the pulleys (alternator, water pump, power steering, crankshaft, etc.) for damage. Even minor pitting or wear can cause a squeal.
* Bearing in another accessory: There might be other components driven by the serpentine belt, such as A/C compressor. Check those components.
* Serpentine Belt Material: Some serpentine belts are made with different materials and some aren't as compatible with certain vehicles. You might need to try a different brand or type of belt.
* Loose Pulley Bolts: Check that all pulley bolts are tightened correctly.
* Incorrect Belt Routing: Double-check that the belt is routed correctly over all the pulleys. A misrouted belt can cause excessive wear and squealing.
Troubleshooting Steps:
1. Listen Carefully: Try to pinpoint the location of the squeal. This will help you narrow down the potential culprits. Does it change with engine speed or steering input?
2. Visual Inspection: Carefully inspect all pulleys and belts for any signs of wear, damage, or misalignment.
3. Check Fluid Levels: Ensure that your power steering fluid is at the correct level.
4. Start and Listen: Start the engine and listen closely. If possible, have someone gently apply pressure to each pulley while the engine is running (be extremely careful!). A squeal that disappears when pressure is applied to a specific pulley usually points to that pulley's bearings being bad.
5. Professional Inspection: If you can't identify the source of the squeal after these steps, it's best to take your Jeep to a mechanic for a professional diagnosis.
Ignoring a squealing belt can lead to more serious problems, so it's crucial to identify and address the issue as soon as possible.
