2004 Chrysler Town and Country 3.8L. Sounds like bearing noise. Had AC recharged today. They indicated everything else with compressor fine. Still have a bearing noise when compressor engages. Can that be alternator bearings when it has additional load added from AC Compressor?

I wouldn't because you need the defrost to work while in Rain with windows up or in the winter. Good luck with finding measurement for mini-van. Not many people void them.

It all depends if the humming sound comes from the engine or the transmission. Check the idler bearings, the water pump bearings or the belt.
also if there is fault on the alternator or AC pulley there can be humming.
finally if the noise is heard while the car moves , then check on wheel bearings and axle ends .

Check your alternator, they can make the same noise. Especially on a Chrysler they are known for Alternator bearing noise that sounds like a power steering noise. Take a scredriver and put the metal end on the alternator and the plastic end to your ear. If you can hear the noise excessively you have bad alternator bearings. Replace the alternator before it goes bad.

It could be your Ac Compressor pulley bearing. Thats what it was for me. I replaced the altenator first too thinking that was it.

possibly not enough or too much freon too much will freeze up

Sounds like a fuse or relay issue.

Not a job for a do-it-yourselfer. Head to a QUALIFIED Auto Shop. It may have a leak that needs repairing before you have it recharged....
Good Luck,

sounds like the ac system can be over charged

Sounds like the bearing and clutch went out. Its best to replace the compressor, unless you got the tools and knowhow to chg. the clutch and bearing. If you just chg. out the compressor, the refregerent has to be drained out first, and then unbolt lines on back of compressor, and electrical wires, and belt, and bolts then remove. Put new compressor on in reverse order. But system should be vacumed be for its recharged with refregerent.

I found a sticker after looking under the hood with the AC information.

Thanks!