89PBR96

99 4.0 and when i'm driving it the motor sounds like a freakin jet air plane even at idle is my clutch fan takin a poo on me ???? it's startin to become annoying and it's botherin me i think it's not right runs and drives fine and stays cool so any ideas

98 JeepJeep

spin the fan blade with the engine cold if it free spins your ok. otherwise you have a idler or something else.

89PBR96

also the compressor fan kick on and off alot when runnin the air or defrost why is this it does fast intervauls

Firestorm500

Compressor is "short cycling" meaning it is low on freon. Federal regulations say leak must be found and fixed, or system must be evacuated of all freon which disables it.

89PBR96

But the fan is not hooked to the comp.? it's electric and the a/c works great the clutch fan on the motor it self is the one that is makin the loud jet airplane noise i will try spinnin it in the morning

89PBR96

Ok it spins fine so what should i look at the idler pulley? can you grease them or anything or just have to replace them thanks

89PBR96

Is it possible that the alternator can make this loud noise? any help from some one that has been in this situation clutch fan works great electric fan is workin great also

jinx

yes it can. my power steering pump made the same noise when it was on its last leg. bearings could be going in your alternator pulley. loosen your belt and check it for play. should turn smooth with no noise. if there is any noise or feels loose and has play, its on its last leg. replace asap.

89PBR96

Thanks will try to get at that tomorrow

jd4x426

while you have your belt make sure to check all the pulleys for play and make sure they spin freely except the crank pulley of course

89PBR96

Thats the plan here i a little bit if i can get motivated i just wondered about the alternator since it's in a bad spot for mud and water and it seems to be the noise i sprayed wd-40 on it yesterday but still made the same noise

JeepCoMJ

umm..: brickwall:


are you TRYING to start a fire? no WD40 on rotating electrical components. it is flammable.

89PBR96

If you spray the pulleys did not no they had wires in the bearings

But i guess i'll have to look for those wires in the pulleys

JeepCoMJ

*sigh*

the bearings are what makes the pulley turn. the a/c and alternators are the only ones with electricals attached to them.

spray every other one you feel like...doesn't matter, since WD40 isn't gonna penetrate a sealed bearing and make it swtop whining, but DON'T spray a flammable substance in something that generates electrical current through friction. that's asking for trouble.

mike37

you have never used WD40 to quiet and old belt
it only a temporary fix so you can tell if the noise is the bely or something in the pulley system

there is nothing hot enough in the engine compartment to make wd lite on fire