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My 1999 Chevy express 1500 has a squealing under the hood you have tried changing belts belt tensioner and new idler pulley noise is still there does anyone any more suggestions?

1. Check the Power Steering Pump: The power steering pump can produce a squealing noise if it is low on fluid or if there is a leak. Check the fluid level and inspect the hoses and connections for leaks.

2. Inspect the Serpentine Belt: Ensure the serpentine belt is in good condition, properly tensioned, and not slipping. A worn or loose belt can cause a squealing noise.

3. Check the Alternator: A faulty or misaligned alternator can cause a squealing noise. Inspect the alternator and ensure it is securely mounted.

4. Examine the Water Pump: A failing or leaking water pump can create a squealing sound. Inspect the water pump for leaks and check if the bearings are worn.

5. Look at the Air Conditioning Compressor: If your vehicle has air conditioning, the compressor can produce a squealing noise if it is low on refrigerant or if there is a leak in the system.

6. Check Pulleys and Idler Arms: Ensure that all pulleys and idler arms are in good condition and not damaged. Worn or misaligned pulleys can cause the belt to slip and create a squealing sound.

7. Check the Fan: If your vehicle has a fan, inspect it for any obstructions or damage. A damaged or unbalanced fan can create a squealing noise.

To troubleshoot further, you may need specialized tools or diagnostic equipment. It is recommended to consult with a qualified mechanic if the noise persists after checking the above components.