[QUOTE=HeyYou;3334716]So can you tell where its coming from? Front of the engine? Trans? Elsewhere?? Does it make the noise at low enough speeds, you could have someone walk beside it, and try and find it?[/QUOTE


Also it only makes the whistle while the truck is moving not when its just idling in neutral and i give it a little bit of gas

 

How old is your serpentine belt? What condition is it in? Got any odd coolant leaks up front?

But, since it only does it when the drivetrain is under load...... probably not the belt.

Hhhmm... Clean the throttle body? See if that helps?

 

That's the COIL wire.

Is it a whistle or a squeal? Sound metallic or airy?

I still think brakes. They can most definitely make noise going one direction and not the other. Or under load, the pad "sits" in a bit, and when coasting it "lifts" a bit. Bad explanation, but do you know what I mean? Bearings can do the same thing: make noise when loaded but not when unloaded, even if spun in the same direction. Did you properly grease and lube all the points of the caliper, pads, etc.?

 

yes i greased and lubed all points i actually had to go back in and make sure i did because i thought i forgot to after i did them. and yea i get it i think, but wouldnt me lubing everything properly stop that from happening? And idk if its more airy or metallic but it doesn't sound like there's any grinding happening if that helps any. just very high pitch and consistent until i let off the gas

 

i can clean that tomorrow and let u know if it works and i wasnt sure if that was the case or not but the belt doesnt look in bad condition thats one of the first things i looked at. what leaks could cause a sound like that?

 

There is a bypass hose between the water pump, and intake... It's under the alt/ac bracket...... so, that has to come off, just to be able to see it.....

 

Another thought is the fan clutch. Mine started with a whine/squealing noise only under power. Finally figured out the culprit for certain after taking it off and going for a short drive. It sounded like a broken vacuum line when I first started chasing it.

 

Serp belt, or tensioner?

 

Does it sound like this? If so, the solution is in the comments.

 

Did you ever get this problem fixed? I'm having the exact same issue.. 03 ram 1500