Chrysler 2005 Crossfire SRT6 Service Manual page 4203

24 - 74 HEATING & AIR CONDITIONING - SERVICE INFORMATION
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
knob (2 and 5) in the full hot position, the Mode Con-
trol Switch Knob (1) in the floor heat position, and the
Blower Motor Switch Knob (6) in the highest speed
position. Using a test thermometer, check the temper-
ature of the air being discharged at the HVAC housing
floor outlets. Compare the test thermometer reading to
the Temperature Reference chart.
Ambient Air Temperature
Minimum Air Temperature at
Floor Outlet
If the floor outlet air temperature is too low, refer to Cooling to check the engine coolant temperature specifications.
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 the Cooling section for the procedures.
OBSTRUCTED COOLANT FLOW
Possible locations or causes of obstructed coolant flow:
• 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.
If proper coolant flow through the cooling system is verified, and heater outlet air temperature is still low, a mechan-
ical problem may exist.
MECHANICAL PROBLEMS
Possible locations or causes of insufficient heat:
• An obstructed cowl air intake.
• Obstructed heater system outlets.
• A blend door not functioning properly.
• An air-bound system.
TEMPERATURE CONTROL
If the heater outlet air temperature cannot be adjusted with the temperature control knob(s) on the A/C Heater con-
trol panel, the following could require service:
• The A/C heater control.
• The blend door actuator(s).
• The wire harness circuits for the A/C heater control or the blend door actuator(s).
Temperature Reference
15.5° C 21.1° C
(60° F) (70° F)
62.2° C 63.8° C
(144° F) (147° F)
26.6° C 32.2° C
(80° F) (90° F)
65.5° C 67.2° C
(150° F) (153° F)
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