Chrysler Sebring 2005 Service Manual page 2082

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HEATING & AIR CONDITIONING (Continued)
HEATER PERFORMANCE
WARNING: Review safety precautions and warnings
in this group before performing this procedure
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - WARNINGS) and (Refer to 24 - HEAT-
ING & AIR CONDITIONING/PLUMBING - CAUTIONS).
Failure to follow the warnings and cautions could
result in possible personal injury or death.
Before performing the following tests, refer to
Group 7 - Cooling System 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. Perform the Heating and A/C
System Self Diagnostics (Refer to 24 - HEATING &
AIR CONDITIONING - DIAGNOSIS AND TESTING
- HEATING AND A/C SELF DIAGNOSTICS). If any
diagnostic trouble codes (DTCs) are found in the body
control module (BCM) or the powertrain control mod-
ule (PCM), repair as necessary.
HEATER PERFORMANCE TEST
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 HVAC housing floor outlets. Compare the test
thermometer reading to the Heater Temperature Ref-
erence chart.
HEATER TEMPERATURE REFERENCE
Ambient Temperature
Celsius Fahrenheit
15.5° 60°
21.1° 70°
26.6° 80°
32.2° 90°
Minimum Floor Outlet
Temperature
Celsius Fahrenheit
62.2° 144°
63.8° 147°
65.5° 150°
67.2° 153°
HEATING & AIR CONDITIONING
If the heater outlet air temperature is below the
minimum specification, refer to Group 7 - Cooling
System. 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 Sys-
tem for more information.
OBSTRUCTED COOLANT FLOW
• 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.
• A plugged heater core.
• Air locked heater core or air in cooling system.
If proper coolant flow through the cooling system is
verified, and heater outlet air temperature is still
low, a mechanical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat:
• An obstructed cowl air intake.
• Obstructed heater system outlets.
• A faulty, obstructed or improperly installed
blend-air door or actuator.
• A faulty blower system.
• A faulty A/C-heater control.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be
adjusted with the temperature control on the heater-
A/C control panel, the following could require service:
• A faulty A/C-heater control.
• Faulty blend door actuator.
• A faulty, obstructed or improperly installed
blend-air door.
• An obstructed cowl air intake.
• The engine cooling system.
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