Air Conditioning/Heater - Operating Procedures
83ford21 Article No. 83-4-12AIR CONDITIONING AND HEATER OPERATING PROCEDURES
LIGHT TRUCKS 1983 RANGER
To better understand the function and operating procedures of the heater and air conditioning on the 1983 Ranger, refer to the following information:
DESCRIPTION AND OPERATION PROCEDURES
The Ranger heater system does not include a shut off door. To avoid objectionable cold drafts when starting in cold weather, the blower can be turned off, the function lever moved to defrost and the temperature lever set at the warmest position. This procedure will improve warm up time and help keep the windshield clear of fogging. When the engine has warmed, the function lever and blower speed can be adjusted for comfort.
Vehicles equipped with air conditioning have a control which includes a push-button switch for operating the A/C system. Because the compressor should not operate while the blower is off (cycles too fast), the control was designed to automatically prevent the button from engaging when the blower is in the OFF position and to disengage the button when the blower switch is turned off.
The control also includes an air door lever which has two positions: "Vent-Heat-A/C", which directs outside air into the system, and "Max-A/C", which shuts off outside air and causes the air to recirculate within the passenger cab area. Effort on this lever was designed somewhat high, to assure positive shut-off in each position. It should be noted that the "Max-A/C" position achieves the best fuel economy when the A/C system is operating in hot weather because no hot, outside air is being introduced and, therefore, cooling load is reduced.
The heater control function lever includes positions of VENT, HI-LO, HEAT, MIX and DEFROST. The A/C control function lever includes positions of PANEL, HI-LO, FLOOR, MIX and DEFROST. Placing the function lever in VENT (or PANEL) causes the air to be discharged from the instrument panel registers. With the lever set at HILO, the discharge air is divided between the panel registers and the floor outlets. This position is designed to be used only when the temperature lever is set at full WARM or full COOL and should not be used when the
temperature lever is set between these extremes because objectionable discharge air temperature will occur (cold from the floor outlets and warm from the registers). In the HEAT (or FLOOR) position, air will be discharged from the floor outlets, with slight bleed from the defrost outlets. When set at MIX, the air will be split between floor and defrost outlets. In DEFROST, all of the air will be discharged from the defrost nozzle except for a small bleed through the floor outlets.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: "INFORMATION ONLY"