My Radiator fan does not want to run. Its not the stock, its a univeral flex-a-lite fan. Here comes the problem though. I disconnect the harness from thermoswitch (the switch by the thermostat) and run a bypass and the fan runs and it stays on. I think the obvious thing to do would be to change the thermoswitch. I did, but the fan still doesn't come on. The car's temp eventually start to get hot, so I would say that it overheats then. My friends and I are stump now, and we can't make out how it works with a bypass but the thermoswitch is not the problem . Any ideas?