98 Yukon Engine Squeal

[Yukonman1998]

Hey all! Im new here and happy to be here. I am having a problem with my 98 GMC Yukon. Basically theres an squeal coming out of the engine bay, but ONLY after the vehicle is warmed up and idling (or if im driving down the road and i take my foot off the gas). I have changed a bad idler pulley, i changed out the serpentine belt twice (used a cheap one, then bought a better quality one), and i just changed out the belt tensioner, there was a massive crack in it so it was wobbly, i assumed that fixed it and it didnt. Im new to diy maintenance and fixing so im not sure where to go from here. Standing over the engine, the squeal gets quieter, standing on the sides is where its loudest. Thanks for helping and im glad to be here!

 

[east302]

Check the power steering pump pulley. The pump shaft should be flush with the pulley flange. If not, the belt will be slightly misaligned and can squeal.

 

[Yukonman1998]

Check the power steering pump pulley. The pump shaft should be flush with the pulley flange. If not, the belt will be slightly misaligned and can squeal.

View attachment 372864

The sound is coming from the left side of the engine. Ill double check that but im at a loss. Its a consistent chirping noise only after the vehicle is warmed up all the way. Im at a loss. I cleaned the pulleys, cleaned the belt, replaced belt, belt tensioner, and idler pulley.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum, and others will chime in. It would be helpful if you make a video of the squealing noise, standing in different parts of the engine bay. Upload the video to YouTube, and then post the link to the video here.

 

[drakon543]

definitely could be one of the accessories causing the issue. does it do with the a/c on or off or both? get the engine warmed too full operating temperature. pop the belt off and check the alternator power steering and a/c for shaft play. in and out side to side every direction you can wiggle it. take note what movement you get. also if a bearing is getting pretty whooped a quick spin by hand should have some noise to it. Good bearings in either of 3 they should be silent or pretty close to silent. shaft play is also a big giveaway hence why i suggested trying to move the shafts then forgot to finish that suggestion until this sentence. also above mentioned ps pulley position is possible but those pulleys are on there pretty good. unless someone messed with the ps pump recently the pulley should still be flush.

 

[exp500]

Possibly the power steering pump- Low RPM "key" here.