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18-18
1977 PONTIAC SERVICE MANUAL
C60 CUSTOM & C65 AUTO. TEMP. A/C FUNCTIONAL
TEST-A, F, G SERIES
Custom engine operating, coolant warm and environment
above 45'~. or 7 ' ~ . (C65 testing ambient should be 75'~. or
24'c.I.
Move
COLD
mode lever to OFF. Set blower switch to HI
(full up) and move temperature lever to full
(all the way to the left).
The blower will run on LO speed with air flow out
the heater outlet only.
The compressor i s not running.
Move mode lever to DEFROST. (Note: Each lever
position has a detent to lock the lever in place.)
Blower comes on HI speed.
Air comes chiefly from defroster nozzles with
some air from heater outlet.
Compressor is running.
Move selector lever to HEATER.
Air comes chiefly from heater outlet with some air
from defroster nozzles.
Compressor i s not running.
Move temperature lever to maximum heat (all the way
to the right).
Note increasing temperature of air from the heater
outlet.
Move mode lever to VENT.
Air comes from A/C outlets.
The compressor i s not running.
Move mode lever to BI-LEVEL.
Air comes from defroster nozzles, heater outlet
and A/C outlets.
The compressor i s running.
Move mode lever to NORMAL.
Air comes from the air conditioning outlets.
Compressor is running.
Move the blower switch to full down, pausing a t each
detent on way.
Blower speed and air flow decrease a step a t each
position.
Move mode lever to MAX.
Blower comes on HI speed.
Air noise i s heard from right front corner of
passenger compartment as system goes on "inside"
air.
Compressor
i s
running.
(Note that there i s a restrictor in the line which will delay
obtaining air from the defroster nozzle in heater and bi-level
mode when coming from any position except defrost.)
C60 A/C FUNCTIONAL TEST-ALL H & X SERIES
C60 CUSTOM A/C FUNCTIONAL TEST-B SERIES
Prior to t e s t initiation, the engine should idle off fast idle
speed cam, with the temperature lever set to maximum COLD,
for aobout 20 ~ i n u t e s or until the engine thermostat i s open
(195 F. or 91 C.). Ambient temperature should be about
75'0~. (24'c.I but not lower than 45'~. (7'c.l or above 90'~.
(32 C.). Control lever efforts must also be checked. These
efforts should not be too low (below 2 Ib. using pull-scale) or
too high (above 6.5 Ib.) or repair/adiustment then be made.
A standard test of the function of the system i s to be
conducted in the following manner:
1.
Doors or windows open.
2.
Selector lever a t NORM A/C with TEMP lever
a t
cold.
3.
Temperature indicators a t condenser inlet and center
outlet.
4.
Start engine and run a t 2000 R.P.M.
5.
After one minute the minimum drop in temperature of
the air from the center outlet should be as follows:
slide mode lever to OFF. set blower switch to HI and
leave the temperature lever in the maximum COLD
position.
CONDENSER INLET
TEMPERATURE
MINIMUM CTR. OUTLET
,TEMP. DROP
Blower air, the same temperature as air outside the
vehicle, will be discharged from the heater outlet.
The blower will run on LO speed only. The
compressor is not running.
Slide the mode lever to NORM. Note the detent a t each
mode position and insure the lever efforts are within
requirements above.
Blower air increases to HI speed and exits from the
A/C outlets. The compressor comes "on" and may
cycle off-and-on. Air temperature should be about
4 5 ' ~ . (7'c.)
a t
the A/C outlets.
Slide the mode lever to BI LEVEL.
Air exits from the A/C outlets and the heater
outlet. The air speed from the A/C outlets
decreases some from Step 2, the compressor comes
"on" and may cycle off-and-on. Air temperature
should be about 45'~. (7'c.b from both the heater
and A/C outlets.
Slide the mode lever to VENT.
Air exits from the A/C outlets only. The air speed
should be HI (comparable to Step
2).
The
compressor i s not running. Air temperature should
be equivalent to air outside the vehicle.
Slide the mode lever to HEATER.
Air exits mainly from the heater outlet with some
air from the defroster nozzle. The compressor is
not running. Air temperature should be equivalent
to air outside the vehicle. Blower speed should s t i l l
be HI.
Slide the temperature lever from maximum COLD to
maximum HOT (far left to far right). Note the lever
effort requirements above.
The air temperature from the heater outlet should
rise rapidlx from outside ambient temperature to
about 140 F. (~o'c.) Blower speed should s t i l l be
HI.
Slide the mode lever to DEFROST.
Air exits mainly from the defroster nozzle with
some air from the heater outlet. The compressor
comes "on"
and may cycle off-and-on. Air
temperature should be about 140'~. (~o'c.).
Blower speed should s t i l l be HI.
Move the blower switch to LO, pausing at each of the
two intermediate positions.
Blower speed and air flow should decrease
accordingly at each position.
Slide the temperature lever to maximum COLD (far left)
and the mode selector to MAX.
Blower comes on HI speed. Air exits from the A/C
outlets only. Air noise i s heard from the right
front corner of the passenger compartment as the
system goes on "inside"
air. The compressor
comes "on"
and may cycle off-and-on. Air
temperature should be about 45'~. (7'c.l at the
A/C outlets.
5052
Fig.
18-1
9 1977 Functional
A/C
Tests
70'~.
21'~.
20'~.
- 7 ' ~ .
8 0 ' ~ .
27'~.
2 5 ' ~ .
- 4 ' ~ .
9 0 ~ ~ . - 1 1 0 ~ ~ .
3 2 ' ~ .
-
43'~.
3 0 ' ~ .
-
1°c.
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