well, dogonit, I don't know how much credibility you have since you disagree with the moderator (these guys know EVERYTHING, right???
)! Just a little sarcasm...
But, it all depends on when the car is overheating. Above 45 MPH you should not need ANY fan, with the airflow being sufficient for heat exchange (I believe no fan can spin fast enough to even match the air flow at that speed). So, if he is overheating at highway speeds, it cannot be a clutch, or anything related to the fans (well, maybe not only the fans...).
Just do the test and it will give us a little more info.