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the belt that touches the fan is the fan belt on all cars, i guess you are asking about electric fans? there are 2 on some cars, or even 3. the front fan is the A/C. the inside, is radiator for engine. all 3 are needed if running AC. the book on this covers all this in spades. RTM http://www.scantool.net/software/alldata-diy-1-month-subscription.html
The fans are radiator cooling fans. They are temperature controled so when you first start your engine in the morning they should not run - UNLESS you start it with your AC on. If you turn your AC on one of them should start operating and the other one will kick on when your engine starts getting hot.
there is a switch in the engine intake or cylinder head that controls the cooling fans. The switch is the one with only 1 green wire hooked to it. Turn the key to run, with the engine stopped pull this wire off and touch it to a ground( cylinder head, engine block) and the fan should start, if not look at the fuse, if it does you need to replace the switch.
Assuming that you are speaking of the radiator fans, they don't normally come on until the engine warms up. If the car was not overheating before the A/C belt belt was replaced, then the fans were working. Start the engine and feel the radiator where the upper engine radiator hose fits. When the thermostat opens, the radiator will suddenly get hot. The fans should come on shortly after that. Check the temperature sensor near where the upper hose comes off of the engine--there should be a wire attached to it. Does the temp gauge move normally?
This does not sound like a theremostate prblem but rather like the heat censor. You can locate this either on the rediator or the engine block (a small round part with one connecting wire.). Just replace the censor and the problem should be solved.
Before you go to the censor just chek the fuse.(usely under the steering on the right.)