Buick LeSabre 1965 Service Manual page 800

ACCESSORIES OPTIONAL HEATER-AIR CONDITIONER SYSTEM 1 1 - 6 7
c. Air Conditioning Checkout Sequence and Trouble
Diagnosis—45000, 46000 and 48000 Series (Cont'd)
Sequence of
Operation of
Controls
Changes That Should Take
Place in the System
Possible Cause of
Malfunctions
Move FAN lever to 1st detent.
(Con't.)
Move the FAN lever thru 2nd,
3rd and 4th detents.
Move Climate Control lever to
NORM.
Move C l i m a t e C o n t r o l to
VENT.
Move C l i m a t e C o n t r o l to
HTR.
The compressor clutch will
engage.
Blower will increase speed to
low, medium and high.
Vacuum will be applied to #1
port of Outside-Rec. diaphragm
thereby fully opening door.
C o m p r e s s o r
disengage.
c l u t c h will
Vacuum will be applied to Htr.
-A/C diaphragm and door will
reposition directing air out of
heater outlets.
D e f e c t i v e or misadjusted
clutch control switch.
Loose or broken wire.
Defective compressor c l u t c h
coil.
Compressor c l u t c h ground
wire broken.
Connector loose at compressor
coil.
NOTE: If neither the blower
motor nor the compressor can
be actuated-check the fuse and
the blower switch.
Defective blower resistor as-
sembly (coils touching).
Defective blower switch.
NOTE: If no high b l o w e r
speed, check blower relay.
Kinked hose.
Outside — Rec. D i a p h r a g m
defective.
Out side—Rec. door sticking.
Outside - Rec. & Htr.-A/C
vacuum disc switch defective.
D e f e c t i v e or misadjusted
clutch control switch.
Defective wiring.
Kinked or pinched hoses.
Htr-A/C diaphragm defective.
Outside-Rec. & Htr.-A/C vac-
uum disc switch defective.
Stic] ing Htr.-A/C door.
Disc
hose
cow
onnected or misconnected
s at connector plug on