Q: Car squeals loudly when turning on and also at times when accelerating with the A.C. on

asked by on

Most of the time when I start my car it gives of a loud squealing sound.. The car will also do it when I accelerate or first leave from a stop sign or stoplight while have the A.C. on, once I turn the A.C. off the car will stop squealing and move a lot faster . I have also noticted it doing when I turn at times but those times I believe the AC was in. I . The serpentine belt was replaced last year. Today a mechanic came out and said that the belt was fine and that it was tightened enough. He believes the alternators bearings are going bad which is causing the squealing that having the A.C. on was causing to much on it, like over working. Should I replace the alternator or is their another issue that could be causing This? I've used belt dressing before and it was only a temporary soultion.

I also have noticed sometimes when I first start the car and try to drive off immediately the car kind of stalls for a second and then goes.

My car has 111167 miles.
My car has an automatic transmission.

If the belt is in good condition and is tightened properly, then suspicion falls on the accessories that it is driving. You could be right about the alternator bearings, but it’s premature to replace the alternator. It could also be a tensioner bearing or even a problem with the air conditioner. If there is a significant drop in power when you turn on the AC, that points to the AC compressor. It may be trying to lock up or if you have had it serviced, it might be overcharged causing a heavy load while it is operating. Too many things need to be checked before you start buying expensive parts. Contact YourMechanic to have a technician come out to your home or office to check out your squealing belts and tell you what your next step should be.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Car squeals loudly when turning on and also at times when accelerating with the A.C. on

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Taillight going on and off

This is a common issue. The bulbs in all the exterior lighting on a vehicle is mounted on a plastic socket. The socket is where the wiring that connects the bulb is housed. Over time these sockets get hard, malformed,...

Q: 1999 Pontiac Grand AM runs rough and smells weird

Hello. An engine running rough at idle could be a vacuum leak creating the wrong fuel ratio for the engine to operate correctly. The smell is probably unburned fuel caused by the vacuum leak issue. The belt shredding could be...

Q: My car has a check engine light and gave codes P2195, P2251, P0170

Based on these fault codes, it sounds like you have an oxygen sensor that as failed and it will need to be replaced. The trouble codes will also have to be cleared after the sensor is replaced to see if...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...