The temperature and the humidity in the air plays a big factor on the efficiancy of the system. If the a/c stays that way, there could be debrit in the way of the recirculation and or problems with the blend door. the door is controled electricly.
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When the engine light comes on, It is a very good idea to stop the car and check the oil and coolant levels . Then take the car and have the fault codes read to find out what set it off.. To ignore a light especially and engine light is to invite a large repair bill in the not too far distance future.
I had 3 S-model and 1 L-model Saturn. Be prepared to replace window regulators, especially as they get to be about 10 years old, but there is nothing bad about that it is an electric motor with a lmited service life like all motors. Find yourself a new replacement regulator on ebay and pay a glass shop to install it. Run you about $150.00 total, if you would prefer a GM dealer will charge you about $500 for the same service.
From what I understand from the dealer, the L series has an issue with a/c compressors. My 2001 LW300 had the same problem. Usually the clutch coil is bad. If you take the 2 wire plug off your compressor and put power to one pin and ground to the other the clutch should lock. If not, replace the clutch. You can buy an aftermarket clutch for about $130. Hopefully your compressor is easier to get at than mine. Good Luck.
My guess would be that your sat nav was retro fitted, i'e not factory fitted. Who ever fitted it didn't use the correct wiring harness. It seems they may have used a wiring harness which didn't have the connection for a CD changer.
If you want to get this fixed you will need to replace the wiring harness which means stripping out the entire interior of your car, i.e seats, carpet, door panel. or you can live with the single CD which works.
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