My wagon has 140,000 miles on it. Just recently when i start it from sitting overnight and start to drive, there is a distinct whining sound that seems to rise and fall with gear changes (automatic) I Changed the transfer case fluid about a 18 months back and also tranny fluid about a year back. I thought it might be the steering pump at first, but that checks out just fine (no noise on turns) and i have read about belts and pulleys ect. Anybody had any similar experience? I will record the sound tomorrow to see if you recognize it :-)
Once the vehicle is at proper temperature there is no sound at all discernible. Any Ideas or similar experiences?

 

Might want to ensure it's not related to a slightly low refrigerant level on your air conditioning system, as it can make that same type of humming/whining noise when low.
Turn off the AC just to make sure. Fingers crossed it's nothing serious.

 

Thanks Rob, i'll check that out, The ultimate driving machine sure is finicky LOL