Dodge Nitro. Manual - part 730

 

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Dodge Nitro. Manual - part 730

 

 

inoperative A/C pressure 
transducer. 

Test the A/C pressure transducer and tighten 
or replace as required. 

 

6. Inoperative evaporator 
temperature sensor. 

6. See SENSOR-EVAPORATOR 
TEMPERATURE
 . Test the evaporator 
temperature sensor and replace as required. 

 

7. Inoperative powertrain 
control module (PCM) or 
engine control module 
(ECM), depending on 
engine application. 

7. Refer to the proper Diagnostic article for 
testing of the PCM or ECM. Test the PCM or 
ECM and replace as required. 

Normal pressures, but A/C 
Performance Test air 
temperatures at center panel 
outlet are too high.

1. Excessive refrigerant oil 
in system. 

1. See REFRIGERANT OIL LEVEL . 
Recover the refrigerant from the refrigerant 
system and inspect the refrigerant oil content. 
Restore the refrigerant oil to the proper level 
as required. 

 

2. Blend door actuator 
improperly installed or 
inoperative. 

2. See ACTUATOR-BLEND DOOR . 
Inspect the actuator for proper operation and 
replace as required. 

 

3. Blend-air door 
inoperative or sealing 
improperly. 

3. See HOUSING-HVAC . Inspect the blend-
air door for proper operation and sealing and 
correct as required. 

The low side pressure is 
normal or slightly low, and 
the high side pressure is too 
low.

1. Low refrigerant system 
charge. 

1. See REFRIGERANT SYSTEM LEAKS . 
Test the refrigerant system for leaks. Repair, 
evacuate and charge the refrigerant system as 
required. 

 

2. Refrigerant flow through 
the A/C accumulator is 
restricted. 

2. See EVAPORATOR-A/C . Replace the 
restricted accumulator as required. 

 

3. Refrigerant flow through 
the A/C evaporator is 
restricted. 

3. See EVAPORATOR-A/C . Replace the 
restricted A/C evaporator as required. 

 

4. Inoperative A/C 
compressor. 

4. See COMPRESSOR-A/C . Replace the 
A/C compressor as required. 

The low side pressure is 
normal or slightly high, and 
the high side pressure is too 
high.

1. A/C Condenser air flow 
restricted. 

1. Check the A/C condenser for damaged fins, 
foreign objects obstructing air flow through 
the condenser fins, and missing or improperly 
installed air seals. Clean, repair, or replace 
components as required. 

 

2. Inoperative radiator 
cooling fan. 

2. Test the radiator cooling fan and replace as 
required. Refer to Group 7. 

 

3. Refrigerant system 
overcharged. 

3. See REFRIGERANT SYSTEM 
CHARGE
 . Recover the refrigerant from the 
refrigerant system. Charge the refrigerant 
system to the proper level as required. 

 

4. Air in the refrigerant 

4. See REFRIGERANT SYSTEM LEAKS 

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

HEATER PERFORMANCE 

Before performing the following tests, refer to COOLING for the procedures to check the engine coolant level 
and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radiator 
air flow and the fan drive operation. 

If vehicle has been run recently, wait 15 minutes before removing the radiator cap. Place a rag over the cap and 
turn it to the first safety stop. Allow pressure to escape through the overflow tube. When the system pressure 
stabilizes, remove the cap completely. 

MAXIMUM HEATER OUTPUT 

Engine coolant is delivered to the heater core through two heater hoses. With the engine idling at normal 
operating temperature, set the temperature control to the full hot position, the mode control to the floor position, 
and the blower motor control to the highest speed position. Using a test thermometer, check the temperature of 
the air being discharged at the front floor outlets. Compare the test thermometer reading to the Heater 
Temperature Reference chart. 

system. 

to test the refrigerant system for leaks. Repair, 
evacuate and charge the refrigerant system as 
required. 

 

5. Engine overheating. 

5. Test the engine cooling system and repair, if 
required. Refer to COOLING . 

The low side pressure is too 
high, and the high side 
pressure is too low.

1. Accessory drive belt 
slipping. 

1. Inspect the accessory drive belt condition 
and tension. Replace the accessory drive belt 
and/or tensioner as required. Refer to 
COOLING . 

 

2. Inoperative A/C 
expansion valve. 

2. See VALVE-A/C EXPANSION . Test the 
expansion valve and replace as required. 

 

3. Inoperative A/C 
compressor. 

3. See COMPRESSOR-A/C . Replace the 
A/C compressor as required. 

The low side pressure is too 
low, and the high side 
pressure is too high.

1. Restricted refrigerant 
flow through the refrigerant 
lines. 

1. See LINE-A/C LIQUIDLINE-A/C 
SUCTION
 and LINE-A/C DISCHARGE
Inspect the refrigerant lines for kinks, tight 
bends or improper routing. Correct the routing 
or replace the refrigerant line as required. 

 

2. Restricted refrigerant 
flow through the A/C 
expansion valve. 

2. See VALVE-A/C EXPANSION . Test the 
expansion valve and replace as required. 

 

3. Restricted refrigerant 
flow through the A/C 
condenser. 

3. See CONDENSER-A/C . Replace the 
restricted condenser as required. 

WARNING:

Do not remove radiator cap when engine is hot, personal injury can result.

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

HEATER TEMPERATURE REFERENCE

If the heater outlet air temperature is below the minimum specification, refer to COOLING . Both of the heater 
hoses should be hot to the touch. The coolant return heater hose should be slightly cooler than the coolant 
supply heater hose. If the return hose is much cooler than the supply hose, locate and repair the engine coolant 
flow obstruction in the cooling system (refer to COOLING for more information). 

OBSTRUCTED COOLANT FLOW 

Possible locations or causes of obstructed coolant flow are as follows: 

Inoperative water pump.  

Inoperative thermostat.  

Pinched or kinked heater hoses.  

Improper heater hose routing.  

Plugged heater hoses or supply and return ports at the cooling system connections.  

Plugged heater core.  

If proper coolant flow through the cooling system is verified, and heater outlet air temperature is low, a 
mechanical problem may exist. 

MECHANICAL PROBLEMS 

Possible causes of insufficient heat due to mechanical problems are as follows: 

Obstructed cowl air intake.  

Obstructed heater system outlets.  

Inoperative engine thermostat.  

Inoperative blower motor system.  

Inoperative A/C-heater control.  

Inoperative blend door actuator.  

Inoperative, obstructed or improperly installed blend-air door.  

TEMPERATURE CONTROL 

If the heater outlet air temperature cannot be adjusted with the temperature control on the A/C-heater control, 
the following could require service: 

Inoperative A/C-heater control.  

Inoperative blend door actuator.  

Ambient Air Temperature 

16°C 

(60°F)

21°C 

(70°F)

26°C 

(80°F)

32°C 

(90°F)

Minimum Air Temperature 
at Floor Outlet
 

52°C 

(125°F)

56°C 

(133°F)

59°C 

(139°F)

62°C 

(144°F)

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

Inoperative, obstructed or improperly installed blend-air door.  

Inoperative related wiring harness or connectors.  

Improper engine coolant temperature.  

SPECIFICATIONS 

A/C SYSTEM 

FASTENER TORQUE 

Item 

Description 

Notes 

A/C Compressor

Zexel DKS-17DS (2.8L/4.0L 
engines)

VC-46 PAG oil

Visteon HS-18 (3.7L engine)

VC-46 PAG oil

Freeze-up Control

Evaporator temperature sensor

Input to A/C-heater control. 
HVAC housing mounted.

Pressure Control

A/C pressure transducer

Input to PCM/ECM. A/C liquid 
line mounted. Cycles clutch off if 
refrigerant pressure falls below 
206 kPa (30 psi) or rises above 
2971 kPa (431 psi)

R-134a Refrigerant Charge 
Capacity

0.510 kg (1.12 lbs.)

Also see A/C Underhood 
Specification Label located in the 
engine compartment.

A/C Clutch Coil Draw

3.3 amps @ 12V ± 0.5V @ 25°C 
(77°F)

2.8L and 4.0L engines. A/C clutch 
field coil resistance when 
measured across coil lead 
connector is 4.02 ± 0.2 ohms @ 
25°C (77°F).

3.1 - 4 amps @ 12V ± 0.5V @ 21°
C (70°F)

3.7L engine.

A/C Clutch Air Gap

0.30 - 0.60 mm (0.012 - 0.024 in.) 2.8L and 4.0L engines.
0.35 - 0.65 mm (0.014 - 0.025 in.) 3.7L engine.

Description 

N.m 

Ft. Lbs. 

In. Lbs. 

All Screws NOT Listed 
Below

1.2

-

10

A/C Compressor Bolts 
(2.8L and 4.0L Engines)

28

21

-

A/C Compressor Rear 
Bolts (3.7L Engine)

55

-

41

A/C Compressor Front 
Inboard Bolt (3.7L 
Engine)

40

-

30

 

2007 Dodge Nitro R/T 

2007 HVAC Heating & Air Conditioning - Service Information - Nitro

  

 

 

 

 

 

 

 

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