* Low Power Steering Fluid: This is the simplest and cheapest thing to check first. Low fluid level can cause problems, especially when hot because the fluid expands. Check the fluid level in the reservoir while the engine is cold. If it's low, top it off with the correct type of power steering fluid (consult your owner's manual). Look for leaks around the pump, hoses, and rack and pinion.
* Power Steering Pump: Heat can exacerbate problems with a failing power steering pump. A pump wearing out will often exhibit weaker assistance as it gets hotter. The pump may be internally leaking or its seals may be failing. This often leads to groaning or whining noises from the pump, especially under load.
* Power Steering Fluid Degradation: Over time, power steering fluid breaks down. Heat accelerates this process. Degraded fluid can't lubricate properly and can contribute to pump failure or damage to other components. A fluid change is recommended regardless of the underlying cause.
* Power Steering Pressure Hose: A hose could be collapsing or becoming restricted when hot due to age or internal damage. This restricts fluid flow. Visually inspect the hoses for cracks, bulges, or kinks.
* Power Steering Rack and Pinion: While less likely to be directly heat-related in the way a pump is, a worn or damaged rack and pinion can exhibit worse symptoms when the fluid is hot and less effective.
* Leaks: Even a small leak can cause problems when the fluid is hot and expands, leading to low fluid pressure. Carefully inspect all the power steering components for any signs of leakage.
Troubleshooting Steps:
1. Check the power steering fluid level: This is the most important first step.
2. Inspect the power steering hoses: Look for cracks, bulges, or leaks.
3. Listen for noises: A whining or groaning sound from the power steering pump is a common sign of a failing pump.
4. Feel the power steering pump: If it's excessively hot to the touch, that's a strong indication of a problem. (Use caution when doing this!)
5. Check for leaks: Look for any signs of fluid leakage around the pump, hoses, and rack and pinion.
If you're not comfortable performing these checks yourself, take your Grand Am to a qualified mechanic. They can properly diagnose the problem and recommend the necessary repairs. Ignoring the issue could lead to more extensive and costly damage.
