Your car want to start Then when it does there is a terrible squealing noise which only goes away I rev the engine been getting worse for last year?

The most likely cause of this issue is a failing serpentine belt. The serpentine belt is a long, thin belt that drives several of your car's accessories, including the alternator, power steering pump, and air conditioning compressor. When the serpentine belt becomes worn or damaged, it can produce a squealing noise, especially when the engine is first started. The noise may also get worse as the belt continues to deteriorate.

In addition to the squealing noise, a failing serpentine belt can also cause other problems, such as:

- Reduced power steering assist

- Dimming headlights

- Slow battery charging

- Overheating engine

If you believe your serpentine belt may be failing, it is important to have it replaced as soon as possible. Replacing the serpentine belt is a relatively simple and inexpensive repair. However, if the belt is not replaced in time, it can cause more serious damage to your car's engine.

Here are some tips for preventing serpentine belt failure:

- Regularly inspect the serpentine belt for signs of wear or damage.

- Replace the serpentine belt at the recommended intervals specified in your car's owner's manual.

- Avoid putting excessive strain on the serpentine belt by using too much power at once.

- If you hear a squealing noise from your engine, have it checked out by a qualified mechanic as soon as possible.