I have a 95 pickup with the 3.0 that has the normal whoooooosh sound while cold which gradually goes away while giving it throttle. What would cause this same "whooooosh" sound to occur even when the motor is to normal operating temp after it idles for a minute or two? What 'cues' the motor into thinking it needs to 'create' this whooooshing sound? What is this whoooooshing sound?

I know this sounds like a question coming from a 2nd grader, but I am just looking for clues to what is actually happening when the engine makes the definite 'jet engine' sound. What tells it to be in this 'mode' and what is failing to make it think it needs to be in this mode even at normal operating temp.

Probably could answer a few questions as to why my truck is having other issues with idling correctly.

Please school this 2nd grader

 

Its the fan clutch engaged, nothing wrong

 

Any chance that the way mine is acting is indicating that it is on it's way out(failing)? Seems like I didn't notice this much noise when I first bought the truck a few months ago.

 

The fan is probably engaging more since its getting warmer outside

 

It's gonna "wooooosh" when it's cold, the clutch has to warm up for a minute when you first start it.

 

Ok, thanks everyone.
This is my first toyota, but it seems to me that the thermal(?) clutch fan is causing the fan to be engaged ALOT even when unnecessary (even in temps that are in the teens/single digits *F ).
But this is completely normal then?

 

I'll reassure you, it's normal. You'll hear the fan at startup, regardless of temperature outside. You'll hear it while taking off, but the fan shouldn't run at high RPMs like 4000. If it does, it's either really hot out or your fan clutch is stuck. A faulty fan clutch might cause the fan blades to kaboom at high RPMs.

 

Unless I'm wrong you can "rebuild" the fan clutch. I think it's oil based and I believe that 4crawler has that rebuild on his site. The Whooooosh is normal though.

 

Thanks junkers88, I'll have to check into that since it now has gotten to the point that it never 'unlocks'. I had a feeling that what it was doing was indicating it was on it's way out.

 

It will never unlock completely as in not spin.
It always spins. Just changes speed.

 

Look thru 4crawlers site about fan rebuilds but yours sounds like it's working. It's when you DON'T here that sound there's a problem....

 

Guys, there is DEFINITELY a problem with mine since I can here it whoooosh going down the road at 65+ miles an hour. It just started acting this bad a couple days ago.
I took the fan section off of the clutch assembly since I don't like the idea of it spinning at 4000+ RPMs

Ebay has brand new clutch assemblies for $31.87/shipped so I just picked one of those up.
I would of rebuilt mine, but by the time I mess around and drive 25 miles to the nearest toyota dealer to buy the proper silicone based oil needed from toyota.........

 

if you removed your fan, do not drive, you will overheat

 

The fan is needed when sitting at idle or driving at slower speeds, etc/etc. Once the vehicle is moving down the road at normal speeds, fresh air being pushed into the radiator is easily able to keep the engine coolant at a safe temperature.