Where is the rad fan relay and the heat sensor for a 96 transport?
This may not be that helpful, but on the 1999, there are two relays and they are both in the fuse relay compartment under the hood, on the passenger on side above the battery.
My car did the exact ame thing, my fan sensor relay (plugs on the motor) came unplugged. Plugged it back up and it still overheated. I went to the part store and bought an new fan sensor relay switch. (around $15-$18) I also replaced the other fan relay sensor. Finally I bought a failsafe thermostat for the car. I have not have a problem. The fan kicks on normally now.
How do you bypass a radiator fan relay so the fan will run whenever the engine is on a 94 Chevy Cavalier?
By running a ground wire-(jumper) across the terminals on the fan motor relay. Find the terminals that connect to the relay's switch, and short them out like the relay would do. Doing this will burn the electric fan motor out very quickly. Your best bet is to replace the relay and possibly the coolant temperature sensor. The sensor is about $16 and the relay about $14 and the fan motor about $38-$50 at Autozone.