No, the system must not lose any air at all ever. Sometimes the computer will release air, but no leaks. The most probable problem is leaking springs which age and crack, but a 2001 vehicle should not have this problem. Spray the springs, solenoids and hoses with soapy water to look for air leaks. You may have a failed solenoid at the top of the spring or a hose burnt by the exhaust or rubbed through.
The leaking components will wear out your compressor very quickly, so do not delay in finding the leak. You can get kits to replace the springs, solenoids and compressor. I will see if I can find some sites.
Hope this helps.
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Art
2000 Taurus SEL Wagon 3.0 Vulcan (daily driver)
1993 Taurus GL Wagon 3.8 Essex
1991 Mercury Grand Marquis LS 5.0
1986 Chevrolet 3/4 ton pickup 4x4 350 with turbo400 and 208 transfer case
1978 Chevrolet 3/4 ton pickup 4x4 custom 6.2 na diesel with turbo400 and 203 transfer case
Planning 2008 Taurus X in a year
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