Air unit well not take freon. 1994 nissan Quest.

Fuse 12 for the brake switch, but it covers a lot of other things as well that would be very noticeable.

Automatic Speed Control Device (ASCD) Brake Switch, Data Link Connector, Combination Meter, Heated Seat Relay, Park Neutral Position Switch, Display Unit, Steering Angle Sensor, Display Control Unit, Navi Control Unit, Back Door Control Unit, Sliding Door Control Unit RH/LH, Sonar Control Unit, Daytime Running Lights, Hands Free Telephone

Nissan Quest (V42; 2004-2009) fuses and relays

Fuse Box Diagrams https://fuse-box.info > nissan > nissan-quest-v42-2004...

Here you will find fuse box diagrams of Nissan Quest 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels inside the car ...

Missing: 1994 ‎' Show results with: 1994

Could be as simple as being low on freon. I would check that first. If the system is charged you should have one cold and one hot line to both the front and rear evaporators.
If the system is full of freon you could have a blend door problem in the dash.

Is the compressor running when the engine is running ?

I believe they only stopped using freon last year in vehicle ac's. That is what it sounds like is the problem.

Touchy situation. Without a machine it's tough. If your system was EMPTY, then you need to add up to what your A/C sticker says.It should be located on radiator support. Fully charged system should read around 35 degrees. Too much freon will cause one to run high pressures also.

YOU HAVE AN AIR LOCK IN SYSTEM IF YOU HAVE A BLEEDER ON TOP OF THERMOSTAT HOUSING BLEED IT THEN TURN ON HEATER TILL ITS HOT

you are low on freon. Front needs more freaon for fixed orifice tube system.

http://groups.yahoo.com/group/villagerquest/

you need to solder front circuit board. I have posted info on this site if you search.

also go here

http://groups.yahoo.com/group/villagerquest/

I also repair for $25 (plus shipping) and your old control head if you can not solder yourself.

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used to be a big deal. today, you can buy kit from autozone or other auto store and do it yourself. Need to discharge R12 into reclaimer so it does not go into air and pollute air.

Then, install R134a fittings on lines, add r134a feon in proper amount with new oil. leave old oil in system. you can buy cans with oil already in the can with the freon. probably need about 6 ounces of oil.
lot's of websites tell how to do this. vidoes on line too.

good luck

Check out Thermostatic Expantion Valve