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3 0 - 1 6
1 9 7 7 PONTIAC SERVICE M A N U A L
STEP 2
-
Start engine and observe if compressor is cycling.
1
Compressor cycling
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1
Proceed t o Step 5
Ezl
STEP 3
-
Refer to Figure 2. Remove foam filter and observe if compressor cycles.
SERVICE VALVE
ESSURE FITTING
d
m
C
U
U
M HOSE
FOAM FILTER AIR INLET
FIGURE 2-CHECKING VACUUM SUPPLY TO COMPRESSOR
I
I
I
Compressor Cycles
Compressor Inoperative
I
Replace Filter
Proceed t o Step 5
1
I
Proceed to Step 4 1
STEP 4
-
With engine running, remove vacuum hose from compressor vacuum port, Figure 2, and check
for vacuum at end of hose.
Vacuum Present
I
Compressor Defective. Repair
or Replace Compressor as
required. See shop
manual for disassembly
procedure.
No Vacuum Present
a
1. Check for Kinked or Pinched
Vacuum Hose
2. Check Where Vacuum is Being
taken from
L
FIG.
3D-23 AUTOMATIC LEVEL CONTROL DIAGNOSIS
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