From Longman Dictionary of Contemporary Englishfan beltˈfan belt noun [countable] TTCthe belt that operates a fan which keeps a car engine cool
Examples from the Corpus
fan belt• My car threw a fan belt at a gas station a few weeks ago.• Nuts, bolts, a broken fan belt dropped from the engine.• Each is driven by an electric fan belt.• And at precisely twelve o'clock the fan belt broke. 