Q: Car producing loud hum when accelerating, engine stalls before starting up

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Hello, during an oil change I was informed that my serpentine belt was almost due to be replaced. They told me that if the car started to make squealing sounds, I would definitely need it replaced. At the time I wasn't prepared to pay to have the replacement done so I told them I would have it done another time. I'm not sure if the noises I hear now are from the serpentine belt, but when I accelerate, it almost sounds as though the car is missing a gear and hums (almost like an airplane). Trying to go from stopped to going uphill also produces sounds...but it is more of a squealing than a hum. I am more than willing to get the belt replaced, but I'm wondering if it is the same problem. Turning the car on sometimes takes a minute or two before the engine rolls over to start (battery has just had recent maintenance). Any advice is appreciated

My car has 78000 miles.
My car has an automatic transmission.

I believe the humming sound you are hearing could be related to a faulty wheel bearing. When wheel bearings dry out they will begin to make humming or growling noises when the vehicle is accelerating.

I would recommend having your wheel bearings inspected by a qualified mechanic, such as one from YourMechanic, to determine the cause of the humming sound.

As for the squealing sound, this could very well be the serpentine belt. I would recommend having that replaced as well if it is making noises or has cracks in it.

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