My primary radiator fan will not come on. I have gotten it hot enough, it should turn on. My A/C fan will work but during this 95+ degree summer it would still run tooo hot without the primary fan. Temp sensor replaced, relays test good, jumping relays primary fan will run. Unplug temp sensor and only the a/c fan will run. I am thinking this only leaves wiring or the brainbox. Anyone have any thoughts to add? Its a 3.1 sedan.