Vacuum Hose Harness; Temperature Door Link To Programmer - Pontiac FIREBIRD 1972 Service Manual

1 B-48
1972 PONTIAC SERVICE MANUAL
Series) and remove sensor attaching screws, Fig. 1B-
44 (B Series).
4. Check to make sure that the temperature (air mix)
door is in the full heat position. The blower air flow
will not hold the door in the proper position.
2. T o replace, reverse removal procedure.
5. Without disturbing the door link or the output shaft
position, tighten the hex screw on the door link.
ATC ELECTRICAL HARNESSES
The electrical harnesses used with the ATC system can be
serviced by performing the operations for A/C electrical
harnesses in Section 1A of this manual. The B Series ATC
harness and the G Series ATC in-car harness require dis-
connecting and connecting of electrical connectors at the
bi-level boost switch (G Series), the in-car sensor, the
programmer, ATC relays, ambient sensor and the potenti-
ometer on the control panel in addition to the procedure
in Section 1A. For B Series ATC electrical harness and G
Series ATC in-car harness installation, see Figs. 1B-44 (B
Series) and 1B-43 (G Series).
The G Series ATC engine (main) harness requires the
disconnection of the connector at the master relay and a
second connector at the ambient switch and sensor. The
remainder of the main harness can be serviced by using the
procedures in Section 1A for main A/C harness.
VACUUM HOSE HARNESS
REMOVE AND REPLACE
Remove cold air distributor duct.
Remove glove box (except G Series with console).
Follow procedures for A/C vacuum harness replace-
ment in Section 1A of this manual with the addition
of disconnecting and connecting the vacuum connec-
tor at the programmer rotary vacuum valve. Vacuum
hose harness routing is illustrated in Figs. 1B-45 and
1B-46 for B and G Series respectively.
TEMPERATURE DOOR LINK TO
PROGRAMMER
ADJUST
-
B SERIES
1. Remove cold air duct and glove compartment and
loosen the hex screw of the door link at the output
shaft of the programmer (Fig. 1B-42).
2. Place the control head selector lever in the DE-
FROST position.
3. Remove the electrical connector from the program-
mer. This results in the proper position of the output
6. Check the adjustment.
A. Connect ATC Tester J 23678 into the wiring har-
ness and the programmer. Place the control head in
AUTO. Place the Manual Automatic switch in the
MANUAL position. Using the MANUAL CON-
TROL, swing the programmer to MAX. HEAT then
to MAX. COLD. Hi blower should be obtained in
both positions.
B. Check for recirculation operation. Operate the sys-
tem with the MANUAL CONTROL on "150" for 5
minutes so the restricted vacuum line can move the
outside air door to the outside air position. With the
control head in HI, move the MANUAL CON-
TROL to MAX. COLD. With all the car doors and
windows closed, the blower noise level should in-
crease when recirculation occurs (approximately 3
minute delay due to the restrictor).
ADJUST
-
G SERIES
1. Remove cold air duct.
2. Remove glove compartment (except models with
console).
3. Loosen screw retaining link to programmer arm and
separate the units (Fig. 1B-47).
4. Disconnect programmer connector shown in Fig. 1B-
48.
5. With ignition on and control lever off, ground termi-
nals 2, 3 and 4.
shaft of the (full heat position). -
Fig.
1 8 - 4 7
Programmer Link Assembly
-
G Series