Honda Acura NSX 1991, Service Manual

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Automatic Climate Control
Special Tools .............................
2
Illustrated Index .........................
3
Heater-Evaporator Door Positions . . 4
Description ................................ 6
*Wiring/Connector Location ..........
9
Circuit Diagram ..........................
22-10
Troubleshooting
Self-diagnosis Indicators
..........
12
Function Selection and Operation
C h e c k .................................... 22-13
Symptom-to-Components Chart. 22-14
Control Unit Signals ...................
22-l 5
Troubleshooting Flowchart.. ......
22-l 6
Blower
Replacement
..............................
22-63
Recirculation Control Motor
Replacement
........................... 22-64
A/C Service Tips and Precautions . . 22-65
*Heater-Evaporator Assembly
Replacement
...........................
22-66
Coolant Temperature Sensor
Removal ................................. 22-68
Evaporator Temperature Sensor
Removal
................................. 22-68
Vent Door Control Motor
Replacement
........................... 22-69
Mode Control Motor
Replacement
...........................
Air Mix Control Motor
Replacement
........................... 22-70
Heater-Evaporator Unit
Disassembly/Reassembly .......... 22-7 1
“DEF” Door Adjustment
......... 22-72
“HEAT” Door Adjustment ........ 22-72
Condenser
Description ................................ 22-73
SUPPLEMENTAL RESTRAINT SYSTEM
Condenser Assembly
Replacement ........................... 22-74
Disassembly/Reassembly .......... 22-75
Compressor
Description .............................
22-76
Replacement ...........................
22-77
Compressor Belt Adjustment .... 22-79
Clutch Inspection ....................
22-80
Clutch Overhaul ...................... 22-8 1
Relief Valve Replacement ......... 22-82
Component Removal/Replacement
*Climate Control Unit ..............
22-84
*In-car Temperature Sensor ..... 22-85
Ambient Temperature Sensor ... 22-86
Sunlight Sensor ......................
22-86
Component Tests
In-car Temperature Sensor
....... 22-87
Ambient Temperature Sensor
... 22-87
Coolant Temperature Sensor .... 22-88
Evaporataor Temperature
Sensor
...................................
22-88
Sunlight Sensor ...................... 22-89
Recirculation Control Motor ...... 22-89
Air Mix Control Motor ............. 22-90
22-90
22-9 1
22-9 1
22-92
22-92
Vent Door Control Motor .........
M o d e Control Motor
................
Aspirator Fan ..........................
Relay
.....................................
Control Unit Adjustment ..............
A/C System Service
Discharge
...............................
Evacuation .............................
Leak Test ...............................
Charging Procedure .................
Performance Test .......................
Pressure Test .............................
22-93
22-93
22-94
22-95
22-96
22-98
The NSX includes a driver’s side located in the steering wheel hub, as part of a Supplemental Restraint
System Information necessary to safely service the is included in this Service Manual. Items marked
in this section include, or are located near, SRS components. Servicing, disassembling or replacing these items will
require special cautions and tools and should therefore be done by an authorized Acura dealer.
To avoid rendering the SRS inoperative, which can lead to personal injury or death in the event of a severe fron-
tal collision, all maintenance must be performed by an authorized Acura dealer.
Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused
by unintentional activation of the
All SRS selectrical wiring harnesses are covered with yellow outer insulation and related components are locat-
ed in the steering column, center console, dash, and dashboard lower panel. Do not use electrical test equip-
ment on these circuits.