Dodge Nitro. Manual - part 768

3. Install new O-rings (8) on the male half of the refrigerant line coupler.  

4. Lubricate the O-rings, and the inside of the female half of the refrigerant line coupler (2) with clean R-

134a refrigerant oil. Use only refrigerant oil of the type recommended for the A/C compressor in the 
vehicle.  

5. Position the female half of the coupler over the male half of the coupler.  

6. Push together firmly on the two halves of the refrigerant line coupler until the garter spring in the cage on 

the male half of the coupler snaps over the flanged end on the female half of the coupler.  

7. Make sure that the refrigerant line coupler is fully engaged by firmly pulling the refrigerant lines away 

from each other on both sides of the coupler.  

8. Install the secondary retaining clip (3) over connected coupler cage (5).  

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

10. Charge the refrigerant system. See REFRIGERANT SYSTEM CHARGE.  

EVAPORATOR-A/C 

DESCRIPTION 

EVAPORATOR-A/C 

Fig. 154: A/C Evaporator Assembly 
Courtesy of CHRYSLER LLC 

The A/C evaporator (1) and its insulator (2) for the heating-A/C system is located within the HVAC housing, 
behind the instrument panel. The A/C evaporator is positioned in the HVAC housing so that all air entering the 
housing must pass over the evaporator fins before it is distributed through the heater core and heating-A/C 
system ducts and outlets. However, air passing over the evaporator fins will only be conditioned when the A/C 

for the R-134a system. The use of any other O-rings may allow the 
connection to leak.

NOTE:

LHD model shown. RHD model similar.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

compressor is engaged and circulating refrigerant through the A/C evaporator.

The A/C evaporator tubes (3) are connected and sealed to the A/C expansion valve by use of rubber O-rings (4) 
and a tapping block (5). 

The A/C evaporator can only be serviced by removing and disassembling the HVAC housing. 

OPERATION 

EVAPORATOR-A/C 

Refrigerant enters the A/C evaporator from the A/C expansion valve as a low-temperature, low-pressure 
mixture of liquid and gas. As air flows over the fins of the A/C evaporator, the humidity in the air condenses on 
the fins, and the heat from the air is absorbed by the refrigerant. Heat absorption causes the refrigerant to boil 
and vaporize. The refrigerant becomes a low-pressure gas when it leaves the A/C evaporator. 

The A/C evaporator has no serviceable parts except for the O-ring seals. The O-ring seals used on the 
connections are made from a special type of rubber not affected by R-134a refrigerant. The O-ring seals must be 
replaced whenever the A/C expansion valve is removed from the A/C evaporator. 

The A/C evaporator cannot be repaired and must be replaced if leaking or damaged. 

REMOVAL 

EVAPORATOR-A/C 

Fig. 155: A/C Evaporator, Foam Insulator, HVAC Housing, Rubber Seal & Tapping Block 
Courtesy of CHRYSLER LLC 

NOTE:

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

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

1. Remove the HVAC housing assembly and place it on a workbench. See REMOVAL.  

2. Disassemble the HVAC housing. See DISASSEMBLY. 

3. Carefully lift the A/C evaporator (1) and the foam insulator (2) out of the lower half of the HVAC 

housing (3). 

4. If required, remove the rubber seal (4) from around the evaporator tubes and tapping block (5).  

INSTALLATION 

EVAPORATOR-A/C 

NOTE:

LHD model shown. RHD model similar.

NOTE:

If the foam insulator around the A/C evaporator is deformed or damaged, 
the insulator must be replaced.

NOTE:

If the rubber seal around the evaporator tubes and tapping block is 
deformed or damaged, the seal must be replaced.

CAUTION: Be certain to adjust the refrigerant oil level when servicing the A/C 

refrigerant system. See REFRIGERANT OIL LEVEL. Failure to properly 
adjust the refrigerant oil level will prevent the A/C system from operating 
as designed and can cause serious A/C compressor damage.

NOTE:

When replacing multiple A/C system components, refer to the Refrigerant Oil 
Capacities chart to determine how much oil should be added to the refrigerant 
system. See REFRIGERANT OIL LEVEL.

NOTE:

If only the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of 
refrigerant oil to the refrigerant system. Use only refrigerant oil of the type 
recommended for the A/C compressor in the vehicle.

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.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

Fig. 156: A/C Evaporator, Foam Insulator, HVAC Housing, Rubber Seal & Tapping Block 
Courtesy of CHRYSLER LLC 

1. If removed, install the rubber seal (4) over the evaporator tubes and tapping block (5). 

2. Carefully install the A/C evaporator (1) and foam insulator (2) into the lower half of the HVAC housing 

(3).  

3. Assemble the HVAC housing. See ASSEMBLY.  

4. Install the HVAC housing assembly. See INSTALLATION.  

5. If the A/C evaporator is being replaced, add 60 milliliters (2 fluid ounces) of refrigerant oil to the 

refrigerant system. When replacing multiple A/C system components, refer to the Refrigerant Oil 
Capacities chart to determine how much oil should be added to the refrigerant system. See 
REFRIGERANT OIL LEVEL. Use only refrigerant oil of the type recommended for the A/C 
compressor in the vehicle.  

LINE-A/C DISCHARGE 

DESCRIPTION 

LINE-A/C DISCHARGE 

NOTE:

LHD model shown. RHD model similar.

NOTE:

Make sure the rubber seal for the evaporator tubes and tapping block is 
properly positioned in the HVAC housing opening.

NOTE:

Make sure that the foam insulator around the A/C evaporator is properly 
positioned within the HVAC housing.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro