Actually that is a common problem, not a safety feature.
Try this, while the engine is running, turn the fan/ac on. If it does not comes on wiggle (slightly) the key in the ignition. Most likely the fan/ac will come on. That is worn contacts in the ignition switch.
1999 Porsche 996 Carrera Convertible
1994 420E - SOLD
1986 300E - SOLD, what a car