1990mudslut

I've always kinda wondered if the engine themselves are just loud or is it just mine.Its sounds like one of those big industrial fans under the hood lol.If Im going down a narrow street where the buildings are close to the road I can hear my engine noise bouncing back at me.

Is this normal for our engine to be kinda loud?

TNRabbit

It's the fan. Check to see if it's frozen in place; it should spin about a quarter turn.

1990mudslut

Hrmm my fan will free turn while the engine is off like I can spin it as much as I want.

Unless your talking about another fan lol

Jay351

Get the truck warm and see how much you can spin the fan.

1990mudslut

Just ran the truck until noraml running temp and still the fan can be free spun.Idk if my fan is normal tho I have never seen a fan like it before.It has a bunnch of blades but all the blades are connected together with a ring.The fan is plastic too.

Jay351

Thats the normal fan. But it sounds like your fan clutch is toast. With the motor warm you shouldnt be able to spin the fan more than a half turn.

1990mudslut

Is that bad?I mean the truck still runs perfectly fine.How hard would it be to replace this clutch?

Jay351

Well, with a worn fan clutch your fan shouldnt kick in. But it sounds like yours is constantly on...

in anycase replacing it is pretty easy. I did mine a few months ago. I tried to do it without removing the rad, but ended up removing it anyways.

remove rad, shroud and fan, then just unbolt the clutch and pull it off. Took me bout an hour or so.

1990mudslut

Did you replace it or service your old one?Either way it doesnt matter lol I just wanna know what will it do if it is bad?My engine runs at a perfect temp and other than low idle and loudness its flawless.

Like what damage can it cause if its always on.

fireman1559

not so much damage as it can just be annoying to you mine went out awhile ago and it drove me crazy it was kinda slugish to but my power came back with a new one which was nice

Team420

A fan that is constantly running will zap your mpg's, as well as power. Other than that.... It shouldnt cause any problems.

Jay351

I just got a good used aisin clutch (with a spare fan) for $15. I can get parts for these things so cheap

idanity

may i recomend to actually compare it to another similar truck...

mine warms up quite loudly, but then simmers down to a sewing maching like noise,
(fresh rebuild last November)
new(er) fan, streamlined, not the big ring around it, and it still makes a lot of noise

but
my point is...your hearing may be more acute than ours, or compared to what your used to. so, its all relative.

also, i know our trucks don't have much insulation for noise, but there is that option to add it. (like BMWs have), that really works, and weighs just a few ounces. (but i like eng noise, and can sometimes miss the feeling of the purrs and roars of my machines)

Jay351

The fan clutch should be engauged for a few seconds after you first start and take off. Thats normal, but it should quiet very quickly.

esanchez

So my fan will spin freely no matter if its cold, been running for a couple of minutes or been driving 50 miles, but it sounds the way that you guys describe with it being engaged while the engine is warming up, but it gets much quieter after its warm or I drive off. How can I tell for sure if this clutch is bad so that I don't have to buy a new one if I don't have to. Also is this a part that ya'll recommend using only the aisin part or is aftermarket ok on this? ( $80-100 price difference)