Section 12 (HVAC Systems (Service Information)): Description: Description

WARNING: This page is about a different car, the 2009 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.

A manual temperature control (MTC) single zone type heating-A/C system or an automatic temperature controlled (ATC) single zone type heating-A/C 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. Before opening or attempting any service to the engine cooling system, see COOLING for more information.

Fig 1: HVAC Housing Assembly

Courtesy of CHRYSLER LLC

NOTE: LHD model shown in illustration. RHD model similar.

All vehicles are equipped with a common heater, ventilation and air conditioning (HVAC) housing assembly (1). The heating-A/C system combines A/C, heating, and ventilating capabilities in a single HVAC housing mounted within the passenger compartment behind the instrument panel. The HVAC housing assembly includes:

Mode-air doors (2)
A/C evaporator (3)
Recirculation door actuator (4)
Air inlet housing (5)
Recirculation-air door (6)
Blower motor (7)
Blower motor resistor (8)
Heater core (9)
Air distribution housing (10)
Blend-air door (11)
Blend door actuator (12
Floor distribution ducts (13)
Mode door actuator (14)

NOTE: An electric positive temperature coefficient (PTC) heater is used on vehicles when equipped with the 2.8L diesel engine. The PTC heater unit compensates for the lower engine coolant temperatures produced by the diesel engine. The PTC heater unit is mounted in the HVAC air distribution housing, downstream of the heater core. See Heating and Air Conditioning/Cabin Heater/UNIT, Heater - Description .

Based upon the 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 panel outlets are located on the top of the housing and the floor outlets are located on each side of the housing. Once the conditioned air exits the HVAC housing, it is further directed through molded plastic ducts to the outlets within the vehicle interior. These outlets and their locations are as follows:

Defroster Outlet - Dual defroster outlets are located in the center of 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 and are integral to the instrument panel air outlets.
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 center of the floor panel near the dash panel.
Rear Floor Outlets - There are two rear floor outlets, one located on each side of the floor console near the rear of each front seat.