Heating And Air Conditioning - Description

DESCRIPTION

A Manual Temperature Control (MTC) single zone or an Automatic Temperature Control (ATC) dual zone heating-air conditioning system is available on this model.

To maintain the performance level of the Heating, Ventilation and Air Conditioning (HVAC) system, the engine cooling system must be properly maintained. The use of a bug screen is not recommended. Any obstructions in front of the radiator or A/C condenser will reduce the performance of the A/C and engine cooling systems.

The engine cooling system includes the radiator, thermostat, radiator hoses and the engine coolant pump. See Cooling System for more information before opening or attempting any service to the engine cooling system.






NOTE: Dual zone system shown. Single zone system similar.

All vehicles are equipped with a common HVAC housing (1). The system combines air conditioning, heating, and ventilating capabilities in a single unit housing mounted within the passenger compartment under the instrument panel. The HVAC housing includes:

- Blend-air door(s) and actuator(s) (2 and 10)
- Heater core (3)
- A/C evaporator (4)
- Recirculation-air door and actuator (5)
- Evaporator temperature sensor (6)
- HVAC wire harness (7)
- Blower motor (8)
- Blower motor resistor or power module (9)
- Mode-air doors and actuators (11)

Based upon the system and mode selected, conditioned air can exit the HVAC housing through one or a combination of the three main housing outlets: defrost, panel or floor. The defrost and the panel outlets are located on the top of the housing and, the floor outlet is located on the bottom of the housing. Once the conditioned air exits the HVAC housing, it is further directed through molded plastic ducts to the various outlets within the vehicle interior. These outlets and their locations are as follows:

- Defroster Outlet - Four defroster outlets are located in the instrument panel top cover, near the base of the windshield.
- Side Window Demister Outlets - There are two side window demister outlets, one is located at each outboard end of the instrument panel top cover, near the belt line at the A-pillars.
- Panel Outlets - There are four panel outlets in the instrument panel, one located near each outboard end of the instrument panel facing the rear of the vehicle and two located near the top of the instrument panel center bezel.
- Front Floor Outlets - There are two front floor outlets, one located above each side of the floor panel center tunnel near the dash panel.
- Rear Outlets - On Crew Cab models there are two outlets located at the rear of the center front seat.