You are thinking about the thermostat. The 3fe calls for a 190* while the 2f has a 180*. Although you can run either one in both engines.I believe the 3fe fan clutch is 190* where the 2f fan clutch is 180*. Minor difference.
Sorry for not having the correct answer for you! I can tell you that for either fan clutch, you can replace the fluid to get it to function properly again. Much cheaper than replacing the whole clutch.My original question was if they are physically identical - are the dimensions the same, will they fit in the same physical spaces.
But lock-up temp would be important too!
I think if I had the appropriate thermostat in the 3FE it could deal with a little cooler fan...
Even a 180 fan vs 190 would beat haveing a fan that is locked all the time now!
I just re-read this and think I understand your original comment better Jim, the hotter radiator is due to the 3FE thermostat, not the physical FJ62 rad...All the 2F, 3F, 3FE fan clutches are architecturally interchangeable.
But do watch out for the temp rating. If a cold clutch (2F) is installed behind a hot radiator (3FE), then the fan will run all the time the thermostat is open.
I swapped out fan clutches over the weekend and it is wonderful not having to listen to the fan roar all the time!If it runs all the time, then the clutch is bad.
Fan should start with engine, roar for a minute or two after startup, then wind down and be quiet until radiator temp locks it up.