It has taken forever for them to figure out the problem! They tried three different fixes and now have come up with that it is the Power Module. Expensive!!

The rear vent only blows heat. Front works fine. This is a known issue

passenger vent always blow hot air, even turn to cool

Summer is coming, Vent blowing hot air, heater is always engaged, what a headache.

AC stopped blowing cold. Mechanic refilled with Freon to include dye so that he could detect a leak. Leak discovered. Leak was due to premature corrosion of the line. A/C line had to be replaced, which was labor intensive and costly. Poor design resulted in my A/C lines corroding after only 3 years and 46000miles.