Please help me understand the opposite problem. During a long cruise on a chilly fall day, fan started working all the time. Even with an absolutely cold engine. It starts when I turn the key before starting the engine and doesn't go off after I shut the engine and turn key to off position. The only way I found to shut the fan down is to turn key to ON again and flip the engine switch from OFF to ON, and that's how fan finally stops. When doing the described, upon turning the engine switch to OFF, dash lights flicker for a fraction of second which has not happened before. Also, shortly after this started, check engine light came on for couple of dozen miles, but then it went off. Didn't try swapping the relays yet, but what else it could be?