How do I diagnose a loud whining noise from the front of my honda accord 2001 . The noise gets louder when i speed up and goes away when driving round left hand bends. I can feel vibration when driving. I'm thinking CV joint or wheel bearings but I not sure which or what side of the car it is coming from

Possible bearing in one of the drive pulleys. I have changed numerous alternators for this noise. Take the belt off and start the car. If the noise goes away you know it will be pulley related and not transmission related. If noise goes away, spin all pulleys by hand to determine the defective/noisy one

Belt may be slipping. Try some belt dressing.

could be a wheel bearing jack the side with the noise & spin the wheel

sounds like the wheels are out of balance, is there a slight vibration through the steering wheel at this speed? and does the problem stop if you go faster (please drive carefully)

Without hearing the noise, it is hard to diagnose. If you replaced the bearings and the noise level is correlated with the speed of the vehicle - I'd look at the wheels/tires. They may be out of balance or you could have a radial shift in one of the tires. Rotate the back tires to the front and front to back. See if that changes the pitch or noise level.

well, without hearing the noise myself, i could guess that the torque converter clutch might be going bad. the torque converter is the part that transfers the power from the engine to the transmission via viscous fluid motion, the converter also has a clutch that internally provides a direct connection inside the converter for better fuel economy. but as with anything labeled as a clutch, it wears down to a point where is slips. the noise your hear could be the torque converter clutch slipping. i owned a 90 astro van with the same drivetrain that made a noise similar to what you speak of up hills. while driving up hills, fully depress the accelerator and if the clunking noise occurs, then the whine goes away as you accelerate faster in a lower gear, very likely this is the case. you would have to have a transmission shop diagnose further. i drove that old van for five more years cause i didn't want to pay to have transmission repaired. it can be very expensive.

Sounds like differential or differential bearings as it happens under load,if it was just wheel bearings it would do it rolling down a hill even with the engine switched off, it needs to be driven by an experienced mechanic to diagnose the noise but thats probably it

Sounds like a pinion bearing or rear axle shaft bearing.

Check the condition of front disc brake pads, if they are in need of replacement a preset little metal arm starts rubbing the discs and will make a whining noise. It doesn't do any damage but it's irritating to listen to.

belt tensioner needs replacing