Dodge Caliber. Manual — part 1410
Condition
Possible Causes
Correction
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. Refrigerant flow through
the accumulator is restricted.
2. See Accumulator in this group. Replace the
restricted accumulator, if required.
3. Inoperative radiator cooling
fan.
3. Test the radiator cooling fan and replace, if
required. Refer to Group 7.
4. Refrigerant system
overcharged.
4. See Refrigerant System Charge in this group.
Recover the refrigerant from the refrigerant
system. Charge the refrigerant system to the
proper level, if required.
5. Air in the refrigerant
system.
5. See Refrigerant System Leaks in this group.
Test the refrigerant system for leaks. Repair,
evacuate and charge the refrigerant system, if
required.
6. Engine overheating.
6. Test the engine cooling system and repair, if
required. Refer to Group 7.
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 or
tensioner, if required. Refer to Group 7.
2. Faulty A/C orifice tube.
2. See A/C Orifice Tube in this group. Replace
A/C liquid line if required.
3. Faulty A/C compressor.
3. See A/C Compressor in this group. Replace
the compressor, if 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 Liquid Line, Suction Line and Discharge
Line in this group. Inspect the refrigerant lines for
kinks, tight bends or improper routing. Correct the
routing or replace the refrigerant line, if required.
2. Restricted refrigerant flow
through the A/C orifice tube.
2. See A/C Orifice Tube in this group. Replace
A/C liquid line if required.
3. Restricted refrigerant flow
through the A/C condenser.
3. See A/C Condenser in this group. Replace the
restricted condenser, if required.
HEATER PERFORMANCE
Before performing the following tests, refer to Group 7 - Cooling for the procedures to check the engine coolant
level and flow, engine coolant reserve/recovery system operation, accessory drive belt condition and tension, radi-
ator air flow and the fan drive operation.
WARNING: Do not remove radiator cap when engine is hot, personal injury can result.
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 sta-
bilizes, remove the cap completely.
MAXIMUM HEATER OUTPUT
Engine coolant is delivered to and from 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 Ref-
erence chart.
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HVAC - SERVICE INFORMATION
24 - 57
HEATER TEMPERATURE REFERENCE
Ambient Temperature
Minimum Floor Outlet Temperature
Celsius
Fahrenheit
Celsius
Fahrenheit
16°
60°
54°
130°
21°
70°
56°
132°
26°
80°
57°
134°
32°
90°
58°
136°
If the heater outlet air temperature is below the minimum specification, refer to Group 7 - 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 Group 7 - Cooling for more information.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow are as follows:
•
Low coolant level
•
Faulty water pump
•
Faulty 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
•
Faulty engine thermostat
•
Faulty blower motor system
•
Faulty A/C-heater control
•
Faulty temperature control cable
•
Faulty, 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:
•
Faulty A/C-heater control
•
Faulty temperature control cable
•
Faulty, obstructed or improperly installed blend-air door
•
Improper engine coolant temperature
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HVAC - SERVICE INFORMATION
PM
SPECIFICATIONS
A/C SYSTEM
Item
Description
Notes
A/C Compressor
Denso 5SE12C
ND-8 PAG oil
Freeze-up Control
Evaporator temperature sensor
Input to A/C-heater control, HVAC
housing mounted, sets compressor
to destroke 2° C below evaporator
target temperature (minimum 5° C
(41° F)) and activates compressor
when within 1° C of evaporator
target temperature
Low psi Control
A/C pressure transducer
Input to PCM/ECM, discharge line
mounted, sets compressor to
destroke below 200 kPa (29 psi),
activates compressor above 234
-262 kPa (34 - 38 psi)
High psi Control
A/C pressure transducer
Input to PCM/ECM, discharge line
mounted - compressor to destroke
above 3130 kPa (454 psi) and
below 200 kPa (29 psi)
Refrigerant Charge Capacity
Refer to the A/C Underhood
Specification Label located in the
engine compartment.
R-134a refrigerant
TORQUE
Description
N·m
Ft. Lbs.
In. Lbs.
All Screws NOT Listed
Below
2
—
17
A/C Accumulator Bracket
Bolts
15
11
—
A/C Accumulator Retaining
Band Bolt
8
—
71
A/C Compressor to Engine
Bolts
25
18
—
Air Distribution Housing
Halves Screws
1.2
—
10
Air Distribution Housing to
HVAC Housing Screws
1.2
—
10
Air Inlet Housing to HVAC
Housing Screws
1.2
—
10
Blend Door Lever Screw
0.6
—
5
Blower Motor Screws
1.2
—
10
Center Duct Screws
2.2
—
20
Defroster Duct Support
Screws
3
—
27
Defroster Duct Screws
2.2
—
20
Demister Duct Screws
2.2
—
20
Flange to HVAC Housing
Screw
1.2
—
10
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HVAC - SERVICE INFORMATION
24 - 59
Description
N·m
Ft. Lbs.
In. Lbs.
Heater Core Tube
Retaining Bracket Screw
1.2
—
10
Heat Shield to Dash Panel
Nuts
1
—
10
HVAC Housing Halves
Screws
1.2
—
10
HVAC Housing to Dash
Panel Nut
4.5
—
40
Lower Condenser Bracket
to Radiator Bolts
4.5
—
40
Mode Door Cam Screw
0.6
—
5
PTC Heater Unit to
Housing Screws
1.2
—
10
Rear Seat Floor Duct
Screw
2.2
—
20
Refrigerant Lines to A/C
Evaporator Bolt
12
—
105
Refrigerant Lines to
Compressor Nuts
20
15
—
Refrigerant Lines to A/C
Condenser Nuts
5
—
44
Refrigerant Line Bracket to
Strut Tower Nut
4.5
—
40
Suction Line to
Accumulator Nut
5
—
44
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HVAC - SERVICE INFORMATION
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