Chrysler Crossfire. Manual — part 1012
A/C EXPANSION VALVE
DESCRIPTION
The Expansion Valve is located at the front of the heater-A/C housing between the liquid and suction lines and the
Evaporator Coil. The expansion valve sprays the refrigerant into the Evaporator.
The Expansion Valve is a factory calibrated unit and cannot be adjusted or repaired. If faulty or damaged, the
expansion valve must be replaced.(Refer to 24 - HEATING & AIR CONDITIONING/PLUMBING/A/C EXPANSION
VALVE - REMOVAL).
OPERATION
When the A/C compressor is switched on the pressure in the evaporator decreases causing the diaphragm (1) to
flex downward in an arch. The tappet (3) follows the motion of the diaphragm and presses the valve ball (4) away
from its seat against the force of the spring (5). The refrigerant is sprayed into the evaporator through the open
valve. Since the motion of the diaphragm (1) is dependent on the intake pressure as well as the temperature at the
evaporator output, only the quantity of refrigerant which can be evaporated optimally is injected.
DIAGNOSIS AND TESTING - A/C EXPANSION VALVE
The Expansion Valve is located on the engine side of the dash panel near the shock tower.
The Expansion Valve can fail in three different positions (open, closed or restricted).
•
Open Position: this will result in a noisy compressor or no cooling. The cause can be a broken spring, broken
ball or excessive moisture in the A/C system. If the spring or ball are found to be defective, replace the expan-
sion valve. If excessive moisture is found in the A/C system, recycle the refrigerant.
•
Closed Position: There will be low suction pressure and no cooling. This may be caused by a failed power
dome or excessive moisture in the A/C system. If the power dome on the expansion valve is found to be
defective replace the expansion valve. If excessive moisture is found recycle the refrigerant.
•
Restricted Orifice: There will be low suction pressure and no cooling. This may be caused by debris in the
refrigerant system. If debris is believed to be the cause, recycle the refrigerant and replace the expansion
valve and the receiver/drier.
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PLUMBING
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REMOVAL
WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PER-
FORMING THE FOLLOWING OPERATION.
1. Evacuate the refrigerant from the system. (Refer to
24 - HEATING & AIR CONDITIONING/PLUMBING
- STANDARD PROCEDURE).
2. Remove the nut (1).
3. Pull the pressure lines off.
4. Remove the screws (2).
5. Remove the expansion valve (3) off of the pressure
lines.
INSTALLATION
1. Install the expansion valve (3) to the pressure
lines.
Note: Tighten the screws evenly to avoid canting.
2. Install the bolts (2). Tighten to 8 N·m (71 in. lb.).
3. Replace the O-rings. Install the pressure lines.
4. Install the nut (1). Tighten to 10 N·m (88 in. lb.).
5. Charge the air conditioning, check for any leakage.
(Refer to 24 - HEATING & AIR CONDITIONING/
PLUMBING - STANDARD PROCEDURE).
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PLUMBING
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HEATER CORE
DESCRIPTION
The Heater Core is located in the HVAC housing, under the Instrument Panel. It is a heat exchanger made of rows
of tubes and fins.
OPERATION
Engine coolant is circulated through heater hoses to the Heater Core (3) at all times. As the coolant flows through
the Heater Core (3), heat removed from the engine is transferred to the Heater Core fins and tubes. Air directed
through the Heater Core picks up the heat from the Heater Core fins. The temperature control door allows control
of the heater output air temperature by controlling how much of the air flowing through the HVAC housing is directed
through the Heater Core (3). The blower motor (2) speed controls the volume of air flowing through the HVAC hous-
ing.
The heater core cannot be repaired and, if faulty or damaged, it must be replaced. (Refer to 24 - HEATING & AIR
CONDITIONING/PLUMBING/HEATER CORE - REMOVAL). Refer to Cooling for more information on the engine
cooling system.
REMOVAL
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPT-
ING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR
SERVICE. DISCONNECT AND ISOLATE THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MIN-
UTES FOR THE AIRBAG SYSTEM CAPACITOR TO DISCHARGE BEFORE PERFORMING FURTHER DIAGNO-
SIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE AIRBAG SYSTEM. FAILURE TO TAKE
THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE
PERSONAL INJURY.
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PLUMBING
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WARNING: REVIEW THE WARNINGS AND CAUTIONS IN THE FRONT OF THIS SECTION BEFORE PER-
FORMING THE FOLLOWING OPERATION.
1. Remove the HVAC housing.(Refer to 24 - HEAT-
ING & AIR CONDITIONING/DISTRIBUTION/HVAC
HOUSING - REMOVAL).
2. Remove the bolts on the cover (1).
3. Unclip the spring clamps.
4. Remove the cover.
5. Remove the guide for the heating water flow pipe
(2).
6. Remove the heating water return line (1).
7. Remove the heater core together with the heating
water pipes.
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