Acura CSX. Manual — part 491
01
SNR9A00G10123625321KBAT00
21-80
Climate Control
Expansion Valve Replacement
A
5 x 0.8 mm
3.2 N·m
(0.33 kgf·m,
2.4 lbf·ft)
B
1. Remove the evaporator core (see page 21-78).
2. Remove the bolts (A) and expansion valve (B).
3. Install the expansion valve in the reverse order of
removal and note these items:
• If you’re installing a new expansion valve, add
refrigerant oil (SP-10) (see page 21-7).
• Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
• Immediately after using the oil, reinstall the cap
on the container, and seal it to avoid moisture
absorption.
• Do not spill the refrigerant oil on the vehicle; it
may damage the paint; if the refrigerant oil
contacts the paint, wash it off immediately.
• Make sure that there is no air leakage.
• Charge the system (see page 21-92).
08/08/21 14:43:42 61SNR030_210_0081
01
02
03
SNR9A00G24100031461KBAT00
21-81
Heater Unit/Core Replacement
A
B
C
8 x 1.25 mm
12.3 N·m
(1.3 kgf·m, 9.0 lbf·ft)
B
A
SRS components are located in this area. Review the
SRS component locations (see page 24-11) and the
precautions and procedures (see page 24-13) before
doing repairs or service.
1. Do the battery terminal disconnection procedure
(see page 22-68).
2. Disconnect the A/C line from the evaporator core
(see page 21-78).
3. Remove the air cleaner housing assembly
(see page 11-345).
4. When the engine is cool, drain the engine coolant
from the radiator (see page 10-8).
5. From under the hood, slide the hose clamps (A)
back. Disconnect the inlet heater hose (B) and the
outlet heater hose (C) from the heater unit. Note the
orientation of the hoses.
Engine coolant will run out when the hoses are
disconnected; drain it into a clean drip pan. Be sure
not to let coolant spill on the electrical parts or the
painted surfaces. If any coolant spills, rinse it off
immediately.
6. Remove the mounting nut from the heater unit.
Take care not to damage or bend the fuel lines or
brake lines, etc.
7. Remove the dashboard (see page 20-108).
8. Disconnect the connector (A) from the blower
motor. Remove the wire harness clip (B).
08/08/21 14:43:43 61SNR030_210_0082
04
05
06
07
21-82
Climate Control
A
A
B
B
C
D
A
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
A
9. Disconnect the connector (A) from the recirculation
control motor.
10. Disconnect the connectors (A) from the mode
control motor, the evaporator temperature sensor,
and the power transistor. Remove the wire harness
clip (B).
11. Disconnect the connectors (A) from the air mix
control motor and A/C wire harness. Remove the
connector clip (B), the wire harness clips (C), and
the wire harness (D).
12. Remove the mounting bolt, mounting nuts, and
blower-heater unit (A).
08/08/21 14:43:44 61SNR030_210_0083
08
01
SNR9A00G10110100000KBAT80
21-83
21-83
A/C Compressor Replacement
A
C
B
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
A
B
13. Remove the self-tapping screws, the heater core
cover (A), the grommet (B). and carefully pull out
the heater core (C).
14. Install the heater core and the evaporator core in
the reverse order of removal.
15. Install the heater unit in the reverse order of
removal, and note these items:
• Do not interchange the inlet and outlet heater
hoses, and install the hose clamps securely.
• Refill the cooling system with engine coolant
(see page 10-8).
• Make sure that there is no coolant leakage.
• Make sure that there is no air leakage.
• Refer to evaporator core replacement (see page
21-78).
16. Do the battery terminal reconnection procedure
(see page 22-68).
NOTE: Do not install an A/C compressor into a system
unless you are completely sure that the system is free
of contamination. Installing the A/C compressor into a
contaminated system can result in premature A/C
compressor failure.
1. If the A/C compressor is marginally operable, run
the engine at idle speed, and let the air
conditioning work for a few minutes, then shut the
engine off.
2. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-90).
3. Remove the drive belt (see page 4-31).
4. Remove the front bulkhead and the condenser fan
shroud (see page 10-19).
5. Remove the splash shield (see page 20-172).
6. Remove the bolt and the nut, then disconnect the
suction hose (A) and discharge hose (B) from the
A/C compressor. Plug or cap the lines immediately
after disconnecting them to avoid moisture and
dust contamination.
08/08/21 14:43:45 61SNR030_210_0084
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