'00...noise (sounds like it could be a bearing) when the defroster is turned on. Same noise is heard when the A/C is activated. If they are left off, everything is normal. The interior fan functions as normal--no noise and although the defroster cycle is noisy, it does work....same for the A/C. I tried listening (with a long dowel) to the a/c compressor, altermator, power steering pump and the cooling fan (radiator) and cannot detect any sound difference with the a/c on, defrost on,....or off. Any suggestions???

Wheel bearings could be the problem. While moving and steering to the left, if the noise increases, it could be the RIGHT wheel bearing. And the opposite when steering to the right. I wouldn't rule out brake noise though. Rotors almost overnight get a surface rust and must be worn off when first driving in the morning. Very common in high humid areas.

probably not a bearing but a low disc pad indicator rubbing on the disc rotor
check pad thickness and if close to 1/8 inch , replace the pads
bearings rumble and are worse on cornering

check left front wheel bearing or cv joint

You have a worn out wheel bearing. Nothing else has this symptom.

Bearing problems in the manual trannies is common, tear it down and rebuild it.

you seem to have a sheering hub bearing. ..the car will have to be raised and to checked but this is usually the issue with that car...I have seen it on xj and x type and some s types also...the noise will get worse as you drive it, but if the sound is a low humming sounds usually thats it,but if its a grinding sound and the car leaning in the rear to the side that has the noise then it is usually a carrier bearing...get her on a stand and keep me posted.

prob a wheel bearing if you think its a tie rod just leave the car off and get under it and wiggle the long arms connecting the front wheels.
if its wheel bearing jack that tire off the ground and try to wiggle it.
ultimatly goto the tire shop and have them look at it.

Does sound stop when you turn LEFT?

Turning RIGHT puts the heavy load on the LEFT front wheel.
That initially STOPPED the noise, correct? So why did you change L?

Turning LEFT puts the load on the RIGHT. Did you change the RIGHT?

Let's say this:
If turning RIGHT stops the noise, it's the RIGHT one that's likely bad.
If turning LEFT stops the noise, it's the LEFT one that's more likely bad.

Make sense? Turning RIGHT loads the LEFT wheel; and vice-versa as the WEIGHT SHIFTS AWAY FROM THE TURN.

More than likely it is what some folks call a CV joint problem, not wheel bearings. Try backing up and then going forward to see if "clunking sound" or a sharp "bang" is heard. Wheel bearings and CV joints only work if smooth. Sometimes a BEARING RACE is bad. Also, a bad spindle / part of the CV joint / transaxle assembly worn or badly machined. If in a WET ENVIRONMENT especially, u may want to try marine grade grease or teflon-added grease.




Does sound come from POWER STEERING PUMP area?

ok you have a bad right front wheel bearing by what you are describing