I had same noise last winter and was belts. Can I ask, unless the belts way way new, why did you not do all tensioners, idlers and belts at the same time? What am I missing?
Crazy screeching noise from '03 6.0
- Thread starter tungsten
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tungsten
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As far as I know theres only 2 idlers,replaced both.The main one is super easy takes 2 minutes.The a/c one is kinda a ***** if truck isnt jacked up.Im a big guy,as far as belts go Im cheap lol.
Replace them now, you cheapskate and use good quality belts and splurge a bit.
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tungsten
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You know maybe its the belt and bearing making the noise? Crazy sound for a belt to make though.Ill stop and get new ones one day.At least now I know what it is I think.Didnt drive it with the a/c belt just hanging behind the main belt.Was scared it would get tangled up.
I only experienced the problem in the cold and was not as cold here and I thought at first it was a vacuum leak. Two days of search and destroy led me to the belts. Took me two days because the temp was not as cold and was hard to duplicate the noise any longer than 1 minute at a time.
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tungsten
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So what is the function of the a/c pump in winter?
It comes on when defrost is engaged.
It comes on when defrost is engaged.
it acts as a dehumidifier
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tungsten
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Thats what I thought,My last truck had no belt ,it broke so I just left it until summer.Didnt have any issues,probably save on gas.
Humidity is not an issue here.
It's best for the a/c pump to run periodically all year 'round. There's a better chance for the seals to stay good.
I had a similar problem years ago on a small block Chevy, due to misaligned pulleys.
As the serpentine belt traversed across the smooth tensioner pulley it was dragged sideways just 1/8". I had to move the alternator back 1/8" and it was finally quiet.
I discovered this by putting straight tubing in the grooves of the pulley before and after the tensioner pulley, and they didn't line up. I used carbon fiber tubing, about 4mm OD from my model airplane construction supplies.
It bugged me for years screeching on cold startups.
As the serpentine belt traversed across the smooth tensioner pulley it was dragged sideways just 1/8". I had to move the alternator back 1/8" and it was finally quiet.
I discovered this by putting straight tubing in the grooves of the pulley before and after the tensioner pulley, and they didn't line up. I used carbon fiber tubing, about 4mm OD from my model airplane construction supplies.
It bugged me for years screeching on cold startups.
