1989 Camry 2.0L 4-cyl. The two cooling fans won't shut off. They function properly when the car is running but won't turn off when the ignition is turned off. I've checked the separate relays for the fans and they appear OK and I replaced the fan switch (in the thermostat housing) which didn't fix the problem. Does anyone know what it could be? I'm a bit of a novice at this but desperately need help. Thank you!!