* Wheel Bearing: This is a very common cause of noises that change with turning. A bad wheel bearing will often produce a growling, rumbling, or grinding sound that increases with speed and turning.
* CV Joint (Constant Velocity Joint): CV joints allow the drive shaft to transmit power to the wheel while the wheel is turning. A failing CV joint can make a clicking, popping, or grinding noise, especially when turning. This is particularly likely on a 4x4 vehicle like the H2.
* Brake Caliper or Pad: A sticking brake caliper can cause dragging, leading to squealing or grinding noises. Worn brake pads can also make squealing noises, though this is less likely to be directly related to turning.
* Steering Components: Problems with the tie rod ends, ball joints, or other steering components can cause clunking or knocking sounds when turning.
* Suspension Components: Worn suspension bushings or ball joints can also produce noises when turning, often a creaking or knocking sound.
* Loose Parts: Something might be loose in the wheel well, such as a shield or brake component, making noise when the vehicle moves and turns.
To help diagnose the problem:
* Listen carefully to the noise: Try to describe it (e.g., grinding, clicking, squealing, rumbling). Does the noise change with speed or the degree of the turn?
* Inspect the wheel and tire: Look for anything obvious, like loose bolts, damaged tires, or debris.
* Check the brake pads and calipers: Look for wear and tear, and check if the calipers are moving freely.
* Jack up the vehicle (safely!) and check the wheel bearing: Try to wiggle the wheel. Excessive play indicates a potential problem. Be extremely cautious when working under a vehicle. Use jack stands, not just a jack.
If you can't identify the problem yourself, it's best to take the Hummer to a qualified mechanic for diagnosis and repair. Ignoring these types of noises can lead to more serious and costly problems down the road, potentially including a loss of control of the vehicle.
