- Wrench Set
- Screwdriver set
- Protective eyewear and gloves
Begin with the vehicle on level ground, engine off with the parking brake set. Step 1 - As the tires of the vehicle contact the ground the tire surface must be smooth for a quite ride. If the tires become cupped or scalloped due to improper balance or alignment they can produce a howling sound at various speeds.
Tire Tread Scallop
Failed Axle Bearing Step 3 - The power steering system will produce a howling noise when the fluid level has dropped and the pump is savaging for fluid, remove the cap and check the fluid level.
Power Steering Fluid Level Step 4 - The car differential is designed to transfer power from the engine to the wheels, when this unit starts to fail it can cause a howling noise when in operation. This is due to excessive wear in the bearings or gear set which will produce metal shavings that are gathered on the internal magnet.
Differential Metal Shavings Step 5 - Automobiles equipped with a fan clutch (rear wheel drive) can experience a howling noise when the fan clutch has locked, to check for this problem start with the engine off, gently check the fan by pushing it in rotation, the fan should move freely, if not replacement is required.
Move Fan Clutch