3rz fan clutch

I have been looking into replacing the fan clutch on my 99 3RZ and was wondering if there is a heavy duty fan clutch available like there is for the 5VZ.

My 99 calls for part number 16210-75060 which is Aisin number

$89 FCT-002 Engine Cooling Fan Clutch - Compatible with Select Toyota 4Runner, T100, Tacoma

FCT-002
In 02 toyota changed to part number

$165 16210-75111 Toyota Fan Clutch - 16210-75111

16210-75111 which is Aisin number FCT-073

Does anyone know the difference between these?

 

Also, I just tested my current clutch and discovered the following:

I can stop the fan from spinning about 60 seconds after startup by holding rolled up paper against the blades.

I can stop the fan from spinning after the truck is at operating temperature (about 194F) with rolled up paper.

The fan spins for a second or two before stopping once the truck is shut off.

Are these all symptoms of a bad fan clutch?

 

Not sure on the part numbers and differences but on the fan clutch test, you should be able to stop it with the paper after cold start up as it shouldn't be engaged then. After engine is at temp, you shouldn't be able to stop it with the paper, it's cooling effects are needed then.
Do you ever show any symptoms of overheating?

 

My truck typically sits at 194F when warmed up, but I have seen it above 200 idling.

 

Fan clutch sounds like a good place to start. Especially since you can stop it with the roll of paper at temp. Replace the clutch fluid with new, I've found the right oil at RC hobby stores. Been a few years so I don't remember the specifics on the viscosity, etc. I remember just swapping in new fluid (thicker viscosity) because I wanted it the fan to engage earlier. Or get a new one, still not a bad idea to put a little heavier fluid in, just based off your location.

 

The fluid viscosity actually has nothing to do with "engaging earlier". The thermal valve opening or closing temperature does it. The fluid viscosity needs to be thick enough to create drag between plates but not to thick so it can flow through the thermal valve freely. If the fluid is to thick the clutch would not engage at all, if it is to thin it will slip.

It is not important how hard is to stop the fan , but if fan is spinning the same rpm as the engine does. If at the the working temperature you rev the engine and the fan does not increase the rpm with it, it means the clutch is slipping and needs to be fixed. If the working temperature is to high it is possible that the thermal valve is opening to late, the valve is clogged or fluid is to thick.

 

Oops, you're correct. Doesn't engage earlier, pulls harder or whatever the words would be to describe that. In the 80 series Cruiser world, it was a mod a few did to help with engines that got a blower or a cruiser that was heavily loaded with weight.