Overheating RTV900

[SpudHauler]

arkansasdelta
I would, change the thermostat, change the coolant using a good brand name like Prestone and flush the system before adding the new coolant. Then do as suggested earlier and clean the rad fins.

And if you want some control, add a wire to the one going to the thermostat by splicing in and run it to one side of a switch. The other side run it to ground. Place the switch beside the emergency handle somewhere, that way it will be easier to wire in because it's closer to the engine and now you will have a manual controlled fan. Switch it on when things get too hot or let the thermostat do it, it's your choice. Both will work because each is just a ground but the switch will give you control on when you feel the fan should or could be on.

 

[Wayne_H]

stop over worrying!! My 900 did the same thing, then I took out the POS gauge and installed an Isspro gauge, and realized the "almost hot in the red" was really 195, right where it was supposed to be.,..

Wayne

 

[rjrhoades]

I am not getting power to the fan (fan is free and radiator is clean). When I ground temperature sensor wire at motor, temperature guage swings all the way over but the relay does not trigger and I do not detect any appreciable voltage at relay coil terminal - only 0.70 volts that does not change whether meter is pegged or not. How much voltage does it take to activate relay (I was assuming 12V).

 

[SpudHauler]

Perhaps this will help.

1= RG red/green to relay should have power all the time with key on. 12v reading here. This is the power into the relay to activate it's switch when the temperature sender reads engine temps that are too high and grounds out. So low voltage or no voltage and the relay will not work. Possibly bad fuse or bad wire feeding the relay.

2= RL red/blue to relay should have power all the time with key on. 12 v reading here. This power gets sent to the fan when the relay is activated, like when the pink wire is grounded. Low or no voltage here is bad fuse or bad wire.

3= P pink to coolant temp switch should be equal to a ground, so touch it to anything grounded and the fan should come on or at least show power to the RB red/black wire going to the fan, when key is on. If fan comes on and it doesn't when engine is too hot, bad temp sender.

4= RB red/black is power to fan when temperature sender reads high or pink is grounded. Low or no voltage here and relay is bad.

5= B black from fan is ground so touch it to ground if unsure it is grounding and with key on, pink grounded, fan should come on.

If you have 12v on RB (red/black) when P (pink) is touched to ground and no fan, fan is bad. Or remove fan and touch wires directly to battery to see if it still doesn't work just to be sure.

You need to be able to read voltage not just if a test light comes on. So a voltage gauge is necessary to test this properly. Relays require 12v to work properly and fans do as well. Check battery voltage while you are at it.

Good luck.