We have a 07 front wheel drive Pacifica with 22,000 miles.We live in south texas, when the outside tempis in the 60`s and belowour Pacifica makes agroaning sound when backing up.Thesound is coming from the rear wheel area and stops when you apply the brakes and we sonetimes get this noise when we make a right hand turn in drive.

Has anybody else had this problem?This never happen when it is hot out.

 

22k, bring it to the dealer. Your still under warranty.