Will be interested to find out which one you figure out it is. Have similar symptoms - groaning and creaking noises from under the dash, passenger side blows hot air with AC on, but sometimes blows cold as it should. Forscan came up with code B2267 - Right Side Blend Door Circuit Failure. If it's a temperature problem and not an airflow problem, I'm wondering if wouldn't be this part: 19E616A (YH-1746) Part Description: With Aux Overhead Heater And A/C ; Temperature Blend Door, With D-Shaped Shaft?
Well I figured mine out with thanks to the posters here and elsewhere on the net.
Same symptoms accept wife not gf. 2007 Ltd. Dual zone. All electronic, no knobs. Drivers side fine. No control on passenger side most of the time. If you screw with the controls enough, sometimes the passenger temperature might change.
1 The dual zone has two blend doors and SIDE MOUNTED blend door controllers. Mine were identical part numbers and black. Remove the side foot console panel and brace only.
2 You do not have to take the dash apart but may wish you did
3 Each actuator has 4 horizontal right left oriented screws. The upper two are difficult to near impossible to get out and REALLY a pain reinstall with normal tools.
4 The upper two screws are not needed for perfect operation!
5 If you have pianists fingers you are in for an hour of frustration,
6 If you do not have pianist fingers double that or more without dash disassembly.
It is not particularly difficult, it is just that if you enjoy swearing at incompetent design and hurling tools, you are gonna love this job!
In mine, I pulled the passenger blend door actuator, disassembled it and found the brushes on the wee little motor were damaged (hence partial operation). They make the damn brushes out of filaments of WIRE!!! Oh that will never burn out now will it? I bought a DorMAN 604-207 from amazon on net recommendations. Inexpensive, delivered to door, no affiliation, your results may vary, check compatibility, made in Korea.
I plugged the new one in and tested it in the open, ran fine. I used the blend door driver gear from the old one to set the blend door full forward(clockwise) and the truck controls to set the new one to the same orientation for insertion in the dash. You must do this or it will never go in.
Once engaged I put in the two lower screws with an 8 mm socket and a 1/4 ratchet. PITA. Then tried to get the upper two in. Finger tight on the upper front and gave up on the upper rear. Plugged it in and tested, all fine. reinstalled he brace and foot panel trim and all is back to normal.
Many thanks again to all that commented and steered my fix.