What would cause my air conditioning on my 2006 subaru tribeca not to work

this may be of help if you do not have the manual with the legend.

Interior Fuse Box Location 2006 2014 Subaru B9 Tribeca 2006 Subaru B9...

Check the power going to the compressor clutch with the AC switch on.If there is votage across the clutch, it may be bad. Not engaging.
If no voltage, you have test the circuit to see why no volts are there.

Diagram reference number 1 in the image below:
"" Fitment: 2006 SUBARU B9 TRIBECA - 4 door

Application Notes:

Category: Electrical. Charging and Starting

SubCategory: Alternator / Generator and Related Components

Position: General

Part Number: 809221090


This is a Serpentine Belt that fits the 2006 SUBARU B9 TRIBECA - 4 door with the EZ30D engine. The Serpentine Belt is designed by SUBARU to be part of the Electrical. Charging and Starting-Alternator / Generator and Related Components. The Serpentine Belt has a position on the vehicle of General. The 2006 SUBARU B9 TRIBECA Serpentine Belt is a factory made SUBARU OEM part and it comes with a 12 month 12.000 mile warranty (parts only). Do not be fooled by an aftermarket SUBARU B9 TRIBECA Serpentine Belt! Buy a factory SUBARU part and receive peace of mind!
This factory part has a part number of 809221090. "

Chlorine in factory coolant has caused corrosion and damaged the heater core (there was a recall on this WWY-09 which my subaru dealer denied!) flushing wont help. Heater core needs to be replaced.

Time to bring it in to the electrical shop! 8 yrs can be a long time.

The solution for the interior lights temp gauge etc. not working is the fuse under the hood as mentioned above.
As for the clock resetting, your battery is probably about to go. The tribeca turns off power to the vehicle if voltage drops below a certain level to save enough power to start back up. This causes the clock to lose memory.

http://www.elightbulbs.com/2006-Subaru-B9-Tribeca-Replacement-Light-Bulbs under car at fog light unscrew cap pull bulb out do not touch new bulb hold at bottom put back in same way

I just encountered the same problem with my 2007 Tribeca. Any info you've found as to what the problem is/was? Thank you!!

Most of the time the dash has to come out to access the actuators on the heater box.

DO NOT buy bulbs anywhere other than SUBARU as replacement. They are specifically long life bulbs. Yes, availlable in other brands in other stores and more cost efficient but not in the long run..