1996 Ford Mustang Owner's Manual - Page 58

If the engine is idling while you are stopped in an open area for long periods of time, open the windows at least one inch (2.5 cm). Also, the heating or air conditioning system should be set to any function except MAX A/C or AUTO. u If you use the heater, set the fan speed on u If you use the air conditioner, set the fan MEDIUM or HIGH with the function control knob at any desired position. speed on MEDIUM or HIGH with the function control knob at any position except OFF and the temperature control lever at mid-position. If the Engine Cranks but Does Not Start or Does Not Start After a Collision Fuel System Shut-off Switch If the engine cranks but does not start or does not start after a collision, the fuel system shut-off switch may have been triggered. The shut-off switch is a device intended to stop the fuel system when your vehicle has been involved in a substantial jolt. Once the shut-off switch is triggered, you must reset the switch by hand before you can start your vehicle. The switch is on the left side of the trunk near the left tail lamp. 57