My 97 doesnt have any vents for third row. The only heat/AC comes from center console. When I removed the center console I found the auxiliary blower in the bottom of the center console. It works fine. What started my effort was no heat. That is, the switch on the dash did not move the door in the heater/ac box. After checking the door and determining that I had heat to the heater/ac box, I thought the actuator was bad. I got a new actuator and tested it with the connector to the exisiting actuator. It would not move. So, I thought the dash switch was bad. After further research, there is 15 amp fuse for backup lights, AC compressor and the actuator. I checked backup lights and indeed they wer not working. Dah! Fuse bad.. Put in a new fuse and all works now.