I have a 2004 ford freestar, and we just had the air compressor changed. It has dual climate controls, and the driver's side will blow outside air while the passenger side cools just fine, but after driving it for about 30-45 minutes the driver's side will eventually start to cool off, but not like the passenger side

SOURCE: I have a 2004 GMC

Remove the Positive Battery Terminal, leave the Negative Terminal connected.  Wait 30 minutes.  Attach the Positive Terminal.  Verify temperature settings is around 70 degrees.  This procedure has been known to resolve computer settings.

SOURCE: Impala has dual climate control. AC blows cold on

with a dual climate control system, it is imperative for a proper refrigerant charge to be maintained. the symptom you describe is a possible indicator of low charge on the system. the ac evaporator core is closest to the right side of vehicle thereby making air feel cooler on that side, on the left side of the vehicle the cooled air has farther to travel and warms up from cabin air before it discharged from the vents. this is the most probable issue for your vehicle...however if the charge is accurate, the issue would be more so in the air temperature doors which is located deep inside the dash...i hope this helps...good luck!

SOURCE: 2004 chevy tahoe, dual climate control, blowing different temps

Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck

SOURCE: air conditioner not blowing cold air

go to a parts store such as Advance Auto Parts or Auto Zone and buy the A/C recharging kit they have with the rubber line and connector that connects only on the side that you need to recharge your system. If you can put air in your tires you can out freon in your a/c system.

SOURCE: 2004 ford freestar air conditioning compressor

Actually, it is very common to be low on coolant. In fact that is the most common cause of your problem. If you are not comfortable doing this your self you will need to go to a shop and have the AC serviced. It is fairly easy. GO to Auto Zone and purchase one of the refill or cool boost cans with a gauge on it. Locate the low pressure side, this is easy in that the fitting on the can will only fit on the low pressure side. Start the vehicle and set the AC to MAX cool. Follow the directions on the can to fill your system. R134a works on pressure in the system. If the pressure falls the cooling falls that is why you felt the cooling better when driving on the highway than you did in traffic. Make sure you don't overfill the system. If you do it is possible that you will damage a seal and end up having to replace the compressor. Good Luck.