After 3 hours of interstate driving, I slowed down and drove through town in gears 3-5 (25-45mph).
When I was in town I started noticing a whining noise that sounded like it was coming from behind the dash.
I turned off the radio and climate control to make sure it wasn't the fan (it was not).
The noise increased with engine speed.
It seemed to go away once I got back up to cruising speeds of 65+mph in 6th but maybe I just couldn't hear it over the increased road noise and engine drone at speed?
Any ideas?
No codes.
Temps and oil pressure were fine.
The truck seemed to drive just fine.
I don't ever recall noticing this fairly distinct noise though.
Is some pump going out soon maybe?
The noise going up and down with engine speed almost sounded like a very quiet supercharger whine if that helps describe it.
Thanks for any help or ideas.
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