Dodge Nitro. Manual — part 766

4. Install the screw (2) that secure the heater core tube flange to the air distribution housing. Tighten the

screws to 1.2 N.m (10 in lbs.).

5. Install the upper front passenger side floor duct (7) onto the air distribution housing and install the two

retaining screws (1). Tighten the screws to 1.2 N.m (10 in lbs.).

6. Install the foam seal (3) onto the heater core tube flange.

7. Install the air distribution housing onto the HVAC housing. See INSTALLATION.

8. Install the HVAC housing assembly. See INSTALLATION.

CORE-VALVE-SERVICE PORT

DESCRIPTION

CORE-VALVE-SERVICE PORT

Fig. 147: Low-Side Service Port, A/C Suction Line, High-Side Service Port & A/C Liquid Line
Courtesy of CHRYSLER LLC

Refrigerant system service ports are used to recover, recycle, evacuate, charge and test the A/C refrigerant
system. Unique sizes are used on the two service ports for the R-134a refrigerant system to ensure the system is
not accidentally contaminated with R-12 refrigerant or by service equipment used for R-12 refrigerant.

NOTE:

If the foam seal for the heater core tube flange is deformed or damaged, it
must be replaced.

NOTE:

If the heater core is being replaced, flush the cooling system. Refer to
CLEANING/REVERSE FLUSHING .

NOTE:

3.7L LHD model shown. 2.8L , 4.0L and RHD models similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

The low-side service port (1) is located on the A/C suction line (2) at either the rear of the engine compartment
or near the A/C compressor, depending on engine and market. The high-side service port (3) is located on the
A/C liquid line (4) near the front of the engine compartment. Both the high-side and low-side A/C service port
valve cores are serviceable.

Each of the service ports has a threaded plastic protective cap installed over it from the factory. The service port
caps are serviceable items.

REMOVAL

CORE-VALVE-SERVICE PORT

NOTE:

The protective cap aids in sealing the service port and helps to protect the
refrigerant system from contamination. Remember to always reinstall the
protective caps onto the service ports when refrigerant system service is
complete.

WARNING:

Refer to the applicable warnings and cautions for this system before
performing the following operation. See WARNING, and CAUTION. Failure
to follow the warnings and cautions may result in serious or fatal injury.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 148: Protective Cap, Service Port & Valve Core
Courtesy of CHRYSLER LLC

1. Remove the protective cap (1) from the service port (2).

2. Recover the refrigerant from the refrigerant system. See REFRIGERANT SYSTEM RECOVERY.

3. Using a Schrader-type valve core tool, remove the valve core (3) from the service port.

4. Install a plug in, or tape over the opened service port(s).

INSTALLATION

CORE-VALVE-SERVICE PORT

NOTE:

Typical A/C service port shown.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 149: Protective Cap, Service Port & Valve Core
Courtesy of CHRYSLER LLC

1. Lubricate the valve core (3) with clean refrigerant oil prior to installation. Use only refrigerant oil of the

type recommended for the A/C compressor in the vehicle.

2. Remove the tape or plug from the service port (2).

3. Using a Schrader-type valve core tool, install and tighten the valve core into the service port(s).

4. Evacuate the refrigerant system. See REFRIGERANT SYSTEM EVACUATE.

NOTE:

Typical A/C service port shown.

CAUTION: A valve core that is not fully seated in the A/C service port can result

in damage to the valve during refrigerant system evacuation and
charge. Such damage may result in a loss of system refrigerant while
uncoupling the charge adapters.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro