2006 ACURA CSX heater

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21-3
Climate Control
Component Location Index
SERVICE VALVE
(HIGH-PRESSURE SIDE)
A/C COMPRESSOR RECEIVER/DRYER DESICCANT
A/C CONDENSER
SERVICE VALVE
(LOW-PRESSURE SIDE)
EXPANSION VALVE
EVAPORATOR CORE
(Located in the heater unit)
(cont’d)
Replacement, page 21-83
Clutch Check, page 21-85
Clutch Overhaul, page 21-86
Thermal Protector Check, page 21-85
Thermal Protector Replacement, page 21-87
Relief Valve Replacement, page 21-87 Replacement, page 21-89
Replacement, page 21-88
Replacement, page 21-80
Replacement, page 21-78
08/08/21 14:40:48 61SNR030_210_0004
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21-5
EVAPORATOR CORE
(Located in the heater unit)
EVAPORATOR TEMPERATURE
SENSOR HEATER UNIT/CORE
RECIRCULATION
CONTROL MOTOR
POWER TRANSISTOR
AIR MIX CONTROL MOTOR DUST AND POLLEN FILTER
CLIMATE CONTROL UNIT
SUNLIGHT SENSOR
IN-CAR TEMPERATURE SENSOR MODE CONTROL MOTORBLOWER UNIT
EXPANSION VALVE
Replacement, page 21-78
Test, page 21-70 Replacement, page 21-81
Test, page 21-74
Replacement,page 21-74
Test, page 21-71
Test, page 21-72
Replacement, page 21-72 Replacement,
page 21-75
Removal/Installation, page 21-75
Test, page 21-69
Replacement, page 21-69
Test, page 21-67
Replacement, page 21-67 Test, page 21-73
Replacement, page 21-73Removal/Installation,
page 21-76
Component Replacement, page 21-77
Replacement, page 21-80
08/08/21 14:40:55 61SNR030_210_0006
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Symptom Diagnostic procedure Also check for
21-16
Climate Control
Symptom Troubleshooting Index







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The blower and heater
controls and the A/C
system do not work
Probable cause: Climate control unit malfunction
Do the climate control power and ground circuit
troubleshooting (see page 21-53) HVAC DTCs (see page 21-9)
Blown fuse No. 36 (10 A) in the
driver’s under-dash fuse/relay
box
Poor ground at G504 (see page
22-30)
Poor or loose connections at the
terminals
The A/C compressor
clutch and the A/C
condenser/radiator
fans are inoperative,
but the blower and
heater controls work Probable cause: A/C pressure sensor circuit
malfunction
Troubleshoot the pressure sensor circuit:
A/C pressure sensor circuit low voltage
(see page 11-301)
A/C pressure sensor circuit high voltage
(see page 11-303)
NOTE: The A/C pressure sensor can malfunction
without setting a DTC HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
A/C signal circuit
troubleshooting (see page
21-64)
Poor or loose connections at the
terminals
The A/C compressor
clutch does not engage,
but the A/C condenser/
radiator fans operate,
and the blower and
heater controls work Probable cause: No power to the A/C compressor
clutch
Do the A/C compressor clutch circuit
troubleshooting (see page 21-62)
HVAC DTCs (see page 21-9)
Blown fuse No. 20 (7.5 A) in the
under-hood fuse/relay box
A/C system pressure is normal
(see page 21-21)
A/C thermal protector has
continuity (see step 4 on page
21-85)
Poor or loose connections at the
terminals
The A/C condenser fan
and/or the radiator fan
do not run with the A/C
on Probable cause: Condenser/radiator fan low
speed circuit malfunction
Do the radiator and A/C condenser fan low speed
circuit troubleshooting (see page 21-56) HVAC DTCs (see page 21-9)
Powertrain DTCs (see page
11-3)
Blown fuse No. 7 (20 A) in the
under-hood fuse/relay box
Poor ground at G301 (see page
22-22)
Poor or loose connections at the
terminals
The condenser/radiator
fans do not run at high
speed, but do run at
low speed Probable cause: Malfunction in the fan(s) high
speed circuit
Do the following troubleshooting as needed:
A/C condenser fan high speed circuit
troubleshooting (see page 21-60)
Radiator fan high speed circuit troubleshooting
(see page 10-26) HVAC DTCs (see page 21-9)
Powertarin DTCs (see page
11-3)
Blown fuse No. 6 (20 A) and/or
No.7 (20 A) in the under-hood
fuse/relay box
Poor ground at G301 (see page
22-22)
Poor or loose connections at the
terminals
Voice commands do
not work Probable cause: Communication problem
between the climate control unit and the
navigation system
Do the navigation communication line circuit
troubleshooting (see page 21-54) HVAC DTCs (see page 21-9)
Navi system link (see page
23-135)
Poor or loose connections at the
terminals
08/08/21 14:40:58 61SNR030_210_0017
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SymptomDiagnostic procedure Also check for
21-18Climate Control
Symptom Troubleshooting Index (cont’d)





 


 


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Warm air comes out of
the vents, and there is
frost on the expansion
valve
Probable cause: The expansion valve is stuck
closed
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
The temperature of the
liquid line is the same
on both sides of the
expansion valve, and
the evaporator coil or
suction line has heavy
condensation Probable cause: The expansion valve is stuck
open
Replace the expansion valve (see page 21-80)
HVAC DTCs (see page 21-9)
Check the old expansion valve
for contamination. If
contaminants are found,
replace the A/C system
component that caused the
contamination
Warm air comes out of
the vents, but
operation is normal
otherwise Probable cause: Compressor failure
Do the A/C system test (see page 21-99), and
correct any problems. If necessary, replace the
compressor (see page 21-83) HVAC DTCs (see page 21-9)
Add refrigerant oil depending
on the part you replaced
(see page 21-7)
Driver’s and
passenger’s side vent
temperatures vary by
more than 11 °C (20 °F) Probable causes: The recirculation control door
or the air mix door is malfunctioning
Do the following troubleshooting:
Recirculation control motor test (see page
21-74)
Air mix control motor test (see page 21-72) HVAC DTCs (see page 21-9)
Poor or loose connections at the
terminals
Insufficient heating 1. 2.
3.
4.
5.
6.
7.Check the coolant level (see page 10-7)
Check the radiator cap (see page 10-4)
Check the coolant temperature during normal
operation
Check the heater core inlet hose temperature:
If it is COLD, check for restrictions in the hose,
a damaged or leaking thermostat, or a
damaged or leaking water pump
If it is HOT, check for restrictions in the
heater core. Back flush or replace the heater
core
Do the air mix control motor test (see page
21-72)
Check the blower motor unit for obstructions
Check for air leaks around the ducts and vents HVAC DTCs (see page 21-9)
Damaged cylinder head gasket
08/08/21 14:40:59 61SNR030_210_0019
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Max Cool: About 0.5 V
Max Hot: About 4.5 V
21-7221-72 Climate Control
Air Mix Control Motor Test
Air Mix Control Motor Replacement
AIR MIX CONTROL MOTOR
B
A
NOTE: Before testing, check for HVAC DTCs (see page
21-9). 1. Disconnect the 7P connector from the air mix control motor.
Incorrectly applying power and ground to
the air mix control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to terminal No. 1 of the air mix control motor, and ground terminal No. 2; the
air mix control motor should run, and stop at Max
Hot. If it doesn’t, reverse the connections; the air
mix control motor should run, and stop at Max Cool.
When the air mix control motor stops running,
disconnect battery power immediately.
3. If the air mix control motor did not run in step 2, remove it, then check the air mix control linkage
and door for smooth movement.
 If the linkage and door move smoothly, replace the air mix control motor (see page 21-72).
 If the linkage or door sticks or binds, repair them as needed.
 If the air mix control motor runs smoothly, go to step 4.
4. Measure the resistance between terminals No. 5 and No. 7. It should be between 4.2 to 7.8 k .
5. Reconnect the air mix control motor 7P connector, then turn the ignition switch to ON (II).
6. Using the backprobe set, measure the voltage between terminals No. 3 and No. 7.
7. If either the resistance or voltage readings are not as specified, replace the air mix control motor
(see page 21-72). 1. Remove the driver’s dashboard undercover
(see page 20-103).
2. Disconnect the 7P connector (A) from the air mix control motor (B). Remove the self-tapping screws
and the air mix control motor from the heater unit.
3. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
08/08/21 14:43:37 61SNR030_210_0073
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21-7321-73
Mode Control Motor Test Mode Control Motor Replacement
MODE CONTROL MOTOR
A
B
A B
NOTE: Before testing, check for HVAC DTCs (see page
21-9).
1. Disconnect the 7P connector from the mode control motor.
Incorrectly applying power and ground to
the mode control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to terminal No. 1 of the mode control motor, and ground terminal No. 2;
the mode control motor should run smoothly, and
stop at Vent. If it doesn’t, reverse the c onnections;
the mode control motor should run smoothly, and
stop at Defrost. When the mode control motor
stops running, disconnect battery power
immediately.
3. If the mode control motor did not run in step 2, remove it, then check the mode control linkage and
doors for smooth movement.
 If the linkage and doors move smoothly, replace the mode control motor (see page 21-73).
 If the linkage or doors stick or bind, repair them as needed.
 If the mode control motor runs smoothly, go to step 4.
4. Use a digital multimeter with an output of 1 mA or less at the 20 k range. With the mode control
motor running as in step 2, check for continuity
between terminals No. 3, 4, 5, and 6 and terminal
No. 7 individually. There should be continuity for a
moment at each terminal as the motor moves past
the switch’s terminal.
5. If there is no continuity for a moment at each terminal, replace the mode control motor (see page
21-73). 1. Remove the glove box (see page 20-104).
2. Remove the wire harness clip (A), the self-tapping
screws, and the passenger’s heater duct (B).
3. Disconnect the 7P connector (A) from the mode control motor (B). Remove the self-tapping screws
and the mode control motor from the heater unit.
4. Install the motor in the reverse order of removal. Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
08/08/21 14:43:38 61SNR030_210_0074
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21-76 Climate Control
Blower Unit Removal/Installation
A
A A
B
B A
1. Remove the glove box (see page 20-104).
2. Cut the plastic cross brace (A) in the glove box
opening with diagonal cutters in the area shown,
and discard it.
3. Remove the bolts and the glove box frame (A). 4. Remove the wire harness clip (A), the self-tapping
screws, and the passenger’s heater duct (B).
5. Disconnect the connector (A) from the blower motor. Remove the wire harness clip (B).
Cut here.
08/08/21 14:43:40 61SNR030_210_0077
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21-81
Heater Unit/Core Replacement
A
B C
8x1.25mm
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).
(cont’d)
08/08/21 14:43:43 61SNR030_210_0082
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