sounds like elec problem, meaning power engaged and is in "on" mode or bearing shot if you mean by hand
The bearing lets the belt pully free wheel on the compressor input shaft that the clutch is attached to.
Yes, this prevents your air conditioning system from freezing over, similar to a frost free fridge. almost every air conditioning system works like this.
check the free on in the compressor and if that's not it you will need a new compressor
Air conditioning uses a compressor to chill the freon that cools the air. The compressor requires a good bit of power to run- and places an additional load on the engine. This requires the engine to burn more fuel, and your gas mileage decreases. There is no free lunch- the power to run that compressor had to come from somewhere, right?
A Pontiac dealership and they will give it to you for free or at least they should or try your local auto parts store
The only way to know for sure is to have the computers trouble codes read with a scan tool. Most auto parts stores such as Advanced and Autozone will do that for free.
The main difference between an oil free compressor and an oil flooded compressor is the method of injection to compress the air for mechanical equipment, most common being construction equipment. In the oil free compressor, air is injected with screws while an oil flooded compressor uses oil injected into the holes to create a seal.
There are several online options to purchase a oil free compressor. i would suggest checking out some of the auctions on Ebay.
best bet for free is a junkyard..
Go to powermate.com, under compressor manuals it should be kla4508065.
You will need to buy a replacement free-wheeling pulley that goes in place of the seized a/c compressor......
The purpose of an air conditioning calculator is to calculate what size air conditioner is needed. One can find these online where they can often be downloaded for free.