Heater Components 1A-41; Heater Core And Case; Water Control Valve 1A-41 - Pontiac FIREBIRD 1972 Service Manual

CUSTOM AIR CONDITIONING
1 A-4 1
Fig. 1A-36 B Series A/C Heater Core and Case Assembly
HEATER COMPONENTS
HEATER CORE A N D CASE
The heater core consists of coola.nt tubes and air fins
between the tubes. Because of the core design, coolant
travels a relatively short distance, therefore, maintaining
a nearly equal pressure at the inlel and outlet. This con-
trolled pressure maintains a higher coolant boiling point
(cooling system pressure will not allow coolant to boil
below approximately 250°F.).
Air passing between the core fins is warmed by the coolant
tubes carrying hot coolant. This warm air is then directed
1
nto the passenger compartment by the blower and ducts.
DIAPHRAGM
I
Fig. 1A-38 B Series Air lnlet Assembly
A B Series A/C heater core and case assembly is shown
in Fig. 1A-36. A typical A/C heater core and case assem-
bly other than B Series is shown in Fig. 1A-37.
WATER CONTROL VALVE
-
B SERIES
The water valve controls the flow of coolant to the heater
core. The valve is open at all settings of the custom air
conditioner except when the control panel is in A/C and
XAPI
AIR
D (
Fig. 1A-37 Typical A/C Heater Core and Case Assembly
-
Except B Series Fig. 1A-39 A and G Series Typical Air lnlet Assembly