Dodge RAM TRUCK 1500 1995 Service Manual page 1670

J R HEATING AND AIR CONDITIONING 24 - 1
C O N T E N T S
page page
AIR CONDITIONING AND HEATER REFRIGERANT SERVICE
7
PERFORMANCE TEST 9 TORQUE SPECIFICATIONS 29
COMPONENT SERVICE
. . . . 1 3
WARNINGS, CAUTIONS AND SERVICE
COMPRESSOR SERVICE . . . . 15 PRECAUTIONS 5
GENERAL INFORMATION
1
HEATING AND AIR CONDITIONING TEST
PROCEDURES . . . . 12
G E N E R A L I N F O R M A T I O N
All vehicles are equipped with a common heater-
A/C housing assembly (Fig. 1). On heater only sys­
tems, the evaporator coil is omitted and replaced
with an air restrictor plate.
TEMPERATURE EVAPORATOR BLOWER
PANEL HEAT HEATER AIR DOOR
DEFROST DEFROST CORE
DOOR DOOR J9324-3
Fig. 1 Common Blend-Air Heater-A/C System
HEATER SYSTEi
All models use a Blend-Air type heater. Outside air
enters the heater through the cowl opening and
passes through a plenum chamber to the heater core.
Air intake openings must be kept free of snow, ice
and other obstructions for the heater system to pick
up a sufficient volume of outside air. A temperature
control door in the heater housing directs incoming
air through and/or around the heater core. The
amount of blend (heated and non-heated air) is deter­
mined by the setting of the temperature knob on the
instrument panel. Direction of the blended air is con­
trolled by the mode knob on the instrument panel
(Fig.
2).
HEAT & A/C HEAT ONLY
MESSAGE CENTER J9424-25
Fig. 2 Heater and A/C
The blower switch and resistor block controls the
speed of the blower motor. This in turn controls the
velocity of the air flow from the FLOOR (heater), DE­
FROST or PANEL outlets.
SIDE WINDOW DEilSTERS
The side window demisters direct air from the
heater assembly. The outlets are located on the top
left and right edges of the door panels. The Demis­
ters operate when the control mode selector is on
FLOOR, Bl-LEVEL, FLOOR/DEFROST or DE­
FROST mode.
HEATING AND AIR CONDITIONING