Not only the fan motors but the sender switch. I have a friend in Houston Texas who has the type that slides between the radiator fins. It failed and the fan quit. We pulled the fan power wire off the connection and wrapped it around the battery post to get home. Good thing it happened on the highway and not in bumper to bumper freeway traffic, that big Olds 442 creates a lot of heat. The second time it happened he put in a switch under the dash to power the fans bypassing the sender switch. Maybe the third time it happens he'll put a real switch in the water crossover.