How soon after you start the cold engine? It should take maybe 5 minutes or more at idle for it to get hot enough to light up the temperature light. It might be your engine temperature sensor is off.

On some years at least, the temp sensor light is supposed to come on while cranking (light testing there).

 

the temp light comes on right away and stays on and the fan wont kick on at all but i checked the fan and it still works, i will replace the engine temp sensor and see if that helps i guess

 

On the 660 the fan is operated by the sensor on the radiator and the overheat light is on the driver side of the head. only single wire on the head. If your fan doesnt come on and you have a new sensor on the Rad-, you need to check the fuse,relay and the connections for corosion.

 

For the 660 there is no relay nor fuse for the fan. There is only the thermoswitch on the radiator and a thermal breaker in the wire harness that that often acts up. The usual problem with that thermal circuit breaker is the fan does not stay on long enough because the breaker cuts out too early, as the fan is running. Corrosion in the wiring is certainly a thing to check for with any and all electrical problems on the Rhino.

What I got out of the initial post is that the overtemp light comes on immediately at cold startup and the expectation is that the fan should be running then as well because it is supposedly 'over-heating'. I would venture to say that the overtemp light is giving a false reading.

 

My bad, your right, just the circuit breaker on the fan switch. And I agree that the overheating sensor is bad.

Rhino Trail Phone. tapatalk

 

Does anybody know if the thermo switch 1 on the cylinder head is supposed to be normally open or normally closed. From the schematic our interpretation is that it's a normally open switch that should close when the temperature becomes too hot. When we actually test out the system on the machine though we have to jumper the wire to ground there by completing the circuit and making the light go out. Can somebody give some insight on this. Is this a "fail safe" system so that if you a break a wire etc. it gives you a warning?

 

From what you are descibing as the operation mode of the light, it would seem that the sensor indeed needs to be normally closed.

 

The sensor IS normally closed when cold.

 

If the engine is cold, the which is closed to ground, for it to come on immediately on startup signifies that the switch is defective, you have a bad connection to the switch, or the wire is disconnected or the wire is broken that attaches to this thermal switch.............