Here's why:
* Helicopter sound: Power steering pumps often make a whining or high-pitched noise, especially under load (like when accelerating or turning). A failing pump can make a significantly louder, almost "helicopter" type of sound.
* Worse with acceleration: The increased demand on the power steering pump when accelerating makes the noise more pronounced if the pump is failing or low on fluid.
* Decreased gas mileage: A malfunctioning power steering pump puts extra strain on the engine, leading to reduced fuel efficiency.
Other possibilities (less likely, but worth considering):
* Alternator: A failing alternator can also make a whining noise, but usually it's more of a high-pitched squeal than a helicopter sound. Poor alternator function can also affect electrical systems and potentially impact gas mileage (though less directly).
* Belt issues: A slipping or worn serpentine belt can cause whining noises and affect the performance of various accessories, including the power steering pump and alternator.
What you should do:
1. Check your power steering fluid: Locate the power steering fluid reservoir (often a small, clear container). Check the fluid level. If it's low, add fluid *of the correct type* (check your owner's manual). However, adding fluid is only a temporary fix – a leak or failing pump is the underlying issue.
2. Inspect the serpentine belt: Look for cracks, fraying, or glazing on the belt. A worn belt can easily slip and make noise.
3. Listen carefully: Try to pinpoint where the noise is coming from. This will help a mechanic diagnose the problem more accurately.
4. Take it to a mechanic: Given the combination of noise and decreased gas mileage, it's crucial to get your Malibu checked by a qualified mechanic as soon as possible. Ignoring the problem could lead to more serious damage and costly repairs. The mechanic can diagnose the exact cause and recommend the appropriate repair. Don't continue driving it extensively with this problem.
Ignoring this issue can lead to complete power steering failure, leaving you unable to steer the car safely. Get it checked out promptly.
