1Squealing or Screeching
High-pitched sounds usually indicate belt issues or brake wear.
- Squealing when starting: Serpentine belt slipping or worn
- Squealing when braking: Brake pad wear indicators
- Squealing when turning: Power steering issues
2Grinding
Metal-on-metal grinding is serious and needs immediate attention.
- When braking: Brake pads completely worn—stop driving
- When shifting: Transmission issues
- When turning: CV joint or wheel bearing failure
3Knocking or Clunking
Thumping sounds often relate to suspension or drivetrain.
- Over bumps: Worn suspension components
- When accelerating: Engine mounts or drivetrain
- When turning: CV joints or tie rods
4Hissing or Sizzling
These sounds suggest fluid leaks onto hot surfaces.
- Under the hood: Coolant leak onto engine
- After parking: Oil or fluid dripping on exhaust
- From tires: Air leak (check for nails)
Key Takeaways
- 1Squealing = belts or brakes
- 2Grinding = stop and get help immediately
- 3Knocking = suspension or drivetrain
- 4Hissing = fluid leak onto hot surface
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