Dodge Nitro. Manual — part 779

should drop by 69 kPa (10 psi). If OK, go to step 7. If not OK, replace the inoperative A/C expansion
valve.

7. Allow the expansion valve control head to thaw. The suction (low pressure) gauge reading should

stabilize at 207 kPa to 345 kPa (30 psi to 50 psi). If not OK, replace the inoperative A/C expansion valve.

8. When expansion valve testing is complete, test the overall A/C system performance. See A/C

PERFORMANCE TEST.

REMOVAL

VALVE-A/C EXPANSION

Fig. 202: A/C Suction Line, Nut, A/C Expansion Valve & A/C Liquid Line
Courtesy of CHRYSLER LLC

1. Recover the refrigerant from the refrigerant system. See STANDARD PROCEDURE.

2. Disconnect and isolate the negative battery cable.

3. Remove the nut (2) that secures the A/C suction line (1) and the A/C liquid line (4) to the A/C expansion

valve (3).

4. Disconnect the A/C suction and liquid lines from the A/C expansion valve, remove and discard the O-ring

seals and position the refrigerant lines out of the way.

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 could result in possible personal
injury or death.

NOTE:

LHD model shown in illustrations. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 203: Bolts, A/C Expansion Valve & Evaporator Tube Tapping Block
Courtesy of CHRYSLER LLC

5. Remove the two bolts (1) that secure the A/C expansion valve (2) to the evaporator tube tapping block

(3).

6. Remove the A/C expansion valve from the evaporator tube tapping block and remove and discard the O-

ring seals.

7. Install plugs in, or tape over the opened refrigerant line and evaporator tube fittings and all expansion

valve ports.

INSTALLATION

VALVE-A/C EXPANSION

NOTE:

Replacement of the refrigerant line O-ring seals and gaskets is required anytime
a refrigerant line is opened. Failure to replace the rubber O-ring seals and metal
gaskets could result in a refrigerant system leak.

NOTE:

LHD model shown in illustrations. RHD model similar.

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

Fig. 204: Bolts, A/C Expansion Valve & Evaporator Tube Tapping Block
Courtesy of CHRYSLER LLC

1. Remove the tape or plugs from the opened refrigerant line and evaporator tube fittings and all of the

expansion valve ports.

2. Lubricate new O-ring seals with clean refrigerant oil and install them onto the refrigerant line and

evaporator tube fittings. Use only the specified O-rings as they are made of a special material for the R-
134a system. Use only refrigerant oil of the type recommended for the A/C compressor in the vehicle.

3. Install the A/C expansion valve (2) onto the evaporator tube tapping block (3).

4. Install the two bolts (1) that secure the A/C expansion valve to the evaporator tube tapping block. Tighten

the bolts to 11 N.m (97 in. lbs.).

Fig. 205: A/C Suction Line, Nut, A/C Expansion Valve & A/C Liquid Line
Courtesy of CHRYSLER LLC

5. Connect the A/C suction line (1) and the A/C liquid line (4) to the A/C expansion valve (3).

6. Install the nut (2) that secures the A/C suction and liquid lines to the A/C expansion valve. Tighten the

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

nut to 23 N.m (17 ft. lbs.).

7. Reconnect the negative battery cable.

8. Evacuate the refrigerant system. See STANDARD PROCEDURE.

9. Recharge the refrigerant system. See STANDARD PROCEDURE.

HEATER-CABIN

HEATER UNIT

DESCRIPTION

HEATER UNIT

Fig. 206: (PTC) Heater Unit, Mounting Plate, Integral Wire Connector Receptacle, Fins & Positioning
Tab

2007 Dodge Nitro R/T

2007 HVAC Heating & Air Conditioning - Service Information - Nitro