Dave, if the fans come on while cruizing, the car has a fault FULL STOP. The fans should come on when the car is getting to the limit of it's operating temperature threshold and this should only happen if the car didn't have sufficient air flow through the radiator. The fans are only there to substitute the natural air flow when sat in traffic. Also the natural flow of air is far greater than the fans can provide.

The fan on my own car NEVER EVER EVER comes in unless I stop and leave the car running for more than 5 minutes or is I am manouvering round a car park for example.

Retarded weegie!