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TRUCK SERVICE MANUAL
TM 5-4210-230-14&P-1
BODIES AND CABS
COMFORT CONTROL
(BLEND AIR)
HEATING AND AIR CONDITIONING SYSTEM
S-SERIES
VEHICLES
CONTENTS
Subject
Page
DESCRIPTION ............................................................................................................
3
AIR CONDITIONING PROCESS ..................................................................................
12
OPERATION . ..............................................................................................................
13
SAFETY PRECAUTIONS .............................................................................................
15
SPECIAL SERVICE TOOLS.........................................................................................
15
MAINTENANCE OPERATIONS: Pre-Season Checks...................................................
18
Off-Season Care ....................................................................................................
19
Air Filter Replacement ...........................................................................................
19
Compressor Drive Belt Alignment and Tension Check ...........................................
20
SERVICE OPERATIONS:
Physical Checks ....................................................................................................
20
Air Conditioning Performance Check (Pressure Test) ............................................
21
Discharging the Air Conditioning System................................................................
21
Checking Compressor Oil Level ............................................................................
22
Evacuating the Air Conditioning System ................................................................
23
Charging the Air Conditioning System (Full Charge) ..............................................
23
Adding Refrigerant to the Air Conditioning System.................................................
24
COMPONENT REMOVAL AND INSTALLATION: Service Hints ...................................
24
Blower Motor and Fan ...........................................................................................
25
Blower Resistor ......................................................................................................
26
Blower Switch.........................................................................................................
26
Compressor ...........................................................................................................
27
Compressor Magnetic Clutch .................................................................................
27
Condenser..............................................................................................................
28
Control Assembly ...................................................................................................
28
Control Cable Replacement....................................................................................
29
Control Cable Adjustment.......................................................................................
31
Evaporator Core.....................................................................................................
31
Expansion Valve ....................................................................................................
33
Fan Drive Override Switch .....................................................................................
33
CTS-2731 Page 1
PRINTED IN UNITED STATES OF AMERICA
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