Metal squeal coming from front

[KAltizer]

Well I consider myself lucky with having my truck since new it's been a GREAT truck but now with 156K on it things are starting to wear out. While I am long time member here things have been tight and the first thing I had to lapse is my membership but I plan to renew soon as I can. I have only had to ask for guidance here twice. So on my way back from visiting my second mom (great Aunt) who is very sick now. My truck made a loud metal squeal like your brake sensor rubbing against rotors sound but not that because all are only 10,000 on them. I "think" it might be the A/C clutch but I was thinking might be the turbo? I noticed while pulling a long hill and EGT's got up into the 900 degree mark and boost was up near 34-36 I would hear that, I ran it all the way home 300 + miles it didn't do it but one more time. I am hoping it's the A/C clutch but is there a way to check the turbo? The only thing I have had to replace on the motor is water pump, tensioner, belt, idler pulley all done at the same time about 15,000 miles ago.
Any thoughts?

Thanks!!!

 

[Hoefler]

Check your boot connections of the charge air circuit and after cooler for possible end coming loose. Also, possible exhaust leak.

 

[KAltizer]

Okay great, thanks for the tip I will check when I get home.

 

[WalterJ]

My terrible under hood squeal was a new (8 month) NAPA Premium Gates belt, that proved to be too hard to run the flat side upon the fan & pump pulleys. No doubt it would last 100K miles, but my old, albeit softer, spare did the trick. It chirped loudly during shutdown; no over-running AC clutch. Alls quiet now. However...

thank goodness I had installed replacement Crank Vibration Damper p/n #ATI-917374, MANUF # 917374, o.d.=7.8", 3 O-Ring shell designed for easy "rebuilding/repair"; smaller than OEM Dia designed to permit changing serpentine belt without removing damper!

...and we found belt could not be removed past the tensioner pulley without loosening it substantially. What up with that? OEM tensioner replaced 2 yrs ago, so only replacements are goofy or OEM's too?