Driver Controls and Instruments CAUTION A sudden increase in transmission oil temperature that is not caused by a load increase may indicate mechanical failure. Bring the vehicle to a safe stop and investigate the cause to prevent further dam- age. Do not operate the vehicle until the cause has been determined and corrected. Heater and Air Conditioner A dash-mounted climate control panel allows you to control all of the heating, air conditioning, defrosting, and ventilating functions. See Fig. 3.31 or Fig. 3.32 . 10/28/94 f010348a Fig.
3.30, Intake-Air Restriction Indicator (installation typical) A three-speed fan switch controls the flow of fresh or recirculated air to any selected air outlets at the wind- shield, door windows, dashboard face, and cab floor. If equipped with air conditioning, an on/off control lever is installed with the fan switch. replacing; however, immediate engine shutdown is not necessary. Transmission Oil Temperature Gauge, Optional An air selection switch controls the direction of warm or cool air either to the feet, to feet and windshield, or to the windshield (defrost).
If equipped with air conditioning, the air selection switch controls the direction of warm or cool air either to the face, to face and feet, to feet and windshield, or to the windshield (defrost). An air-source lever is also used to With an Allison automatic transmission, the transmission oil temperature gauge reading should not exceed 250°F (121°C) during normal operation. A warning light will activate to alert the driver. 3.44