Fan belt adjustment on 1992 Volkswagen Jetta

On my 92 jetta the a/c,water pump and alternator belts keep losing the proper adjustment as the car is driven for a day or two.....why is that?

Asked by for the 1992 Volkswagen Jetta
1 answer
If "V" belts they settle down into pulley and will need readjusted. The way they are being adjusted is suspect if happens repeatedly. How are they tensioned?