Noise

[Bigjimmy]

Hoping for a bit of help lads.
2008 Denali 85,000 miles
On cold startups I have what sounded like a squeal/bearing noise that gets louder in first 2 gears then quietens down.When the engine is warm theres no noises
All fluid levels fine.
It’s had new pulleys and belts and a water pump and alternator
I was convinced it was the water pump as it sounds like it’s coming from the front of the engine but new pump has made no difference.
I like my stuff to be right so this is getting to me!
Any help much appreciated

 

[Doubeleive]

Hoping for a bit of help lads.
2008 Denali 85,000 miles
On cold startups I have what sounded like a squeal/bearing noise that gets louder in first 2 gears then quietens down.When the engine is warm theres no noises
All fluid levels fine.
It’s had new pulleys and belts and a water pump and alternator
I was convinced it was the water pump as it sounds like it’s coming from the front of the engine but new pump has made no difference.
I like my stuff to be right so this is getting to me!
Any help much appreciated

first thing I would do is before you start it up in the morning while it is cold, take the belt or belts off and spin what you can be hand and see if you can determine the source of the noise. usually it turns out to be a tensioner.
your 08 may or may not have a ac stretch belt, if it has a tensioner that is your primary suspect.

 

[Geotrash]

Another worthwhile step is to get a cheap mechanic's stethoscope and use it to pinpoint where the noise is coming from. A/C compressor is another possibility.

 

[Bigjimmy]

All pulleys and tensioners have been changed

 

[Bigjimmy]

Could it be the starter failing to disengage maybe?Whys it fine when warm though??

 

[Bigjimmy]

Should have said thank you for such a quick response guys,this is a bit of a strange one

 

[B-train]

I would start where @Doubeleive stated. I have the same truck and you can drop both belts off with a 15mm socket and ratchet. Tensioner for main and A/C belts. With belts off, start it and listen. If it's cool/ cold out, you could even go for a quick drive and see what it sounds like if you need more verification - you just won't have power steering BTW.

 

[donjetman]

Should have said thank you for such a quick response guys,this is a bit of a strange one

Take the belts off, run the engine briefly, then report back here.

 

[Bigjimmy]

Ok guys thank you,will take belts off tomorrow morning and report back

 

[Bigjimmy]

Ok had the belts off started her up and …………..no noises
put the belts back on and ……….no noises ‍‍
Turned her off and checked it over,there is a very slight ply in the power steering pulley.Could it be the pumps on its way out?