The tr6 did not come with an electric fan (after market only) There are two types of controled fans, one with a preset thermostat that kicks on around 180 degrees--the other has an adjustable thermostat. If it is wired direct to a battery source it will run anytime the water temp is up to the set degrees on the thermostate (even with the key off),if it is wired to an ignition source it will run when the ignition is on (if water temp is up). It could run all the time(even when cold) if you have a bad thermostat. If you have a plastic fan blade with an extention bolted on to the crankshft pulley--then you have a stock fan that only turns with the engine running (non electric).