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HEATING & AIR CONDITIONING - SERVICE INFORMATION
HEATING & AIR CONDITIONING - SERVICE
INFORMATION
DESCRIPTION
COOLING SYSTEM REQUIREMENTS
DESCRIPTION - HEATER AND AIR
CONDITIONER . . . . . . . . . . . . . . . . . . . . . . . 61
DESCRIPTION - RESIDUAL ENGINE HEAT
SYSTEM (REST) . . . . . . . . . . . . . . . . . . . . . . 63
DESCRIPTION - REFRIGERANT SYSTEM
SERVICE PORT . . . . . . . . . . . . . . . . . . . . . . . 63
OPERATION
HEATER AND AIR CONDITIONER
HEATING & AIR CONDITIONING - SERVICE INFORMATION
DESCRIPTION
COOLING SYSTEM REQUIREMENTS
To maintain the performance level of the Heating & Air Conditioning System, the engine cooling system must be
properly maintained. Any obstructions in front of the radiator or condenser will reduce the performance of the Air
Conditioning and Engine Cooling Systems.
The engine cooling system includes the heater core and the heater hoses. Refer to Cooling for more information
before attempting any service to the Engine Cooling System.
DESCRIPTION - HEATER AND AIR CONDITIONER
WARNING: THE AIR CONDITIONING SYSTEM CONTAINS REFRIGERANT UNDER HIGH PRESSURE. SEVERE
PERSONAL INJURY MAY RESULT FROM IMPROPER SERVICE PROCEDURES. REPAIRS SHOULD ONLY BE
PERFORMED BY QUALIFIED SERVICE PERSONNEL.
AVOID BREATHING THE REFRIGERANT AND REFRIGERANT OIL VAPOR OR MIST. EXPOSURE MAY IRRI-
TATE THE EYES, NOSE, AND/OR THROAT. WEAR EYE PROTECTION WHEN SERVICING THE AIR CONDI-
TIONING REFRIGERANT SYSTEM. SERIOUS EYE INJURY CAN RESULT FROM DIRECT CONTACT WITH THE
REFRIGERANT. IF EYE CONTACT OCCURS, SEEK MEDICAL ATTENTION IMMEDIATELY.
DO NOT EXPOSE THE REFRIGERANT TO OPEN FLAME. POISONOUS GAS IS CREATED WHEN REFRIGER-
ANT IS BURNED. AN ELECTRONIC LEAK DETECTOR IS RECOMMENDED.
IF ACCIDENTAL SYSTEM DISCHARGE OCCURS, VENTILATE THE WORK AREA BEFORE RESUMING SER-
VICE. LARGE AMOUNTS OF REFRIGERANT RELEASED IN A CLOSED WORK AREA WILL DISPLACE THE
OXYGEN AND CAUSE SUFFOCATION.
THE EVAPORATION RATE OF R-134a REFRIGERANT AT AVERAGE TEMPERATURE AND ALTITUDE IS
EXTREMELY HIGH. AS A RESULT, ANYTHING THAT COMES IN CONTACT WITH THE REFRIGERANT WILL
FREEZE. ALWAYS PROTECT THE SKIN OR DELICATE OBJECTS FROM DIRECT CONTACT WITH THE
REFRIGERANT.
THE R-134a SERVICE EQUIPMENT OR THE VEHICLE REFRIGERANT SYSTEM SHOULD NOT BE PRESSURE
TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR AND R-134a HAVE BEEN
SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DAN-
GEROUS, AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE.
HEATING & AIR CONDITIONING - SERVICE INFORMATION 24 - 61
TABLE OF CONTENTS
page
DIAGNOSIS AND TESTING
. . . . . . 61
SPECIFICATIONS
CONTROLS
DISTRIBUTION
. . . . . . . . . 65
PLUMBING
OPERATION - REST SYSTEM
A/C PERFORMANCE
DIAGNOSIS AND TESTING - HEATER
PERFORMANCE . . . . . . . . . . . . . . . . . . . . . . 73
A/C APPLICATION TABLE
SPECIFICATIONS - CHARGE CAPACITY
SPECIFICATIONS - TORQUE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
. . . . . . . . . . . . . . . . . . . . . . . . . . 92
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
page
. . . . . . . . . . . . 69
. . . . . . . . . . . . . . . . . . . 70
. . . . . . . . . . . . . . . 75
. . . . 75
. . . . . . . . . . . . 75
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