Squealing sound under load

[Rog13]

Hi Everyone, I have a 2013 Explorer, V6. I noticed in the last couple of days, from a cold start to about 10 to 20 minutes into the run, a fairly loud squealing sound. Coming from the front end area. It is more pronounced while under load, quiet when idling at a stop. I have changed the Tensioner and Belt today and it is still doing it. Alternator is less than a year old, AC Compressor is about a month old. So I would think those pulleys would be OK. checked the Brakes and they are all good. Any ideas??

 

[texsn95]

Idler pulley maybe? If there is one, not sure on those. Regardless get a cheap mechanic's stethoscope from harbor freight and that will help you locate the noise.