If you drive a Volkswagen with a fan belt problem, it can be very dangerous. The fan belt is responsible for keeping the cooling system and the alternator connected to the engine. If the fan belt breaks, the cooling system and alternator can become disconnected and cause overheating, alternator failure, and even engine failure. This means that your car could simply shut off and leave you stranded, or it could suffer extensive internal damage. The only way to avoid this is to get the fan belt problem fixed.