sensor CHEVROLET CAMARO 1967 1.G Chassis User Guide

HEATER AND AIR CONDITIONING 1A-71

SUN-AMBIENT

SENSOR AND COMPRESSOR

CLUTCH SWITCH

HIGH BLOWER

DELAY RELAY

THERMAL

VACUUM

VALVE

Fig.
102-Comfortron Underhood Wiring

use when inspecting a damaged vehicle equipped with air

conditioning.

1.
Remove the drive belt. Cut belt off if necessary.

2.
Visually inspect the condenser, receiver-dehydrator,

compressor, mounting brackets, conditioning unit, all

connecting lines, and all controls to determine the

extent and nature of the damage.

a. No repairs, such as soldering, welding or braz-

ing, should be attempted on the condenser be-

cause of its construction. If the vapor passages

in the horizontal tubes or return bends or mani-

folds have been damaged in any way, the con-

denser should be replaced with a new one.

b.
The receiver-dehydrator should be replaced if

there is any evidence of its having sustained

either internal damage or a fracture at any of

the lines or welded joints or if the system has

been exposed to the atmosphere for an undeter-

mined period of time.

c. Examine the compressor for any visible external

damage.

d. The evaporator should be examined for damage

and, if necessary, removed or replaced or the

entire unit processed where damaged or exposed

to the atmosphere.

e. All connecting lines and flexible hoses should be

examined throughout their entire length for dam-

age.
If damaged in any manner, replace with new

lines.
f. Check all controls and connecting wires for

damage and replace with new parts where needed.

g. Check the clutch pulley for proper operation and

freedom from damage.

3.
Install gauge set.

4.
Purge the system. Pressure should not exceed 3 to

5 pounds.

5. Remove the compressor from mounting and remove

the oil test fitting.

6. Pour out the oil into a clean glass container and ex-

amine it for any foreign substance such as dirt,

water, metal particles, etc. If any of these are

present, the compressor and receiver-dehydrator

should be replaced and the other system components

should be flushed with liquid refrigerant.

7. If the oil is clean and free of any harmful substance,

replace oil with Frigidaire Oil available through

Parts Stock.

NOTE:
If the system components have been

replaced or flushed, replace the full charge of

oil. If not, add no more fresh oil than was

drained in Step 6.

8. Charge up the compressor to drum or can pressure

and leak test the compressor seals prior to in-

stallation of compressor.

9. Reinstall the compressor and evacuate the system

by following the Evacuating Procedure.

CHEVROLET CHASSIS SERVICE MANUAL

ACCESSORIES
15-6

port thereby supplying vacuum to the Servo unit.

During system operation
the
following events occur:

1.
Car
speed below
20
mph—no function
of the
unit

because
the
rubber drum
has
not rotated
far
enough

to close
the
solenoid points.
No
energizing current

can flow through the solenoid coil.

2.
Car
speed above
20
mph—The tang
on the
rubber

drum
has
closed
the
solenoid points
and
current
is

flowing through
the 40 ohm
resistance wire
to the

solenoid coil. This current
is
not sufficient to "pull

in", the solenoid.

3.
Driver partially presses Engagement Switch—full

voltage flows through
the
solenoid
to
pull
it
into

operation. Solenoid
cam
tension
on the "U"
clip
is

released and the clip grips the rubber drum. Simul-

taneously the vacuum switch operates; applying man-

ifold vacuum
to the
Servo unit which tightens
the

throttle chain. When
the
driver releases pressure

from
the
accelerator pedal
the
unit will position the

throttle
to
maintain the speed
at
the time
of
solenoid
operation.

Driver releases
the
Engagement Switch—current

flows
to the
solenoid through
the 40
ohm wire and

since the solenoid is "pulled in", the reduced current

flow
is
sufficient to hold
it
in position.

The
car
begins
to
ascend
a
hill—car speed drops

slightly (very slightly) and the magnetic force on the

driven disk
of the
speed sensor
is
decreased.
The

disk rotates slightly
(as
would
a
speedometer shaft

because
of
hairspring tension) turning
the
rubber

drum. Since
the "U"
clip
is
gripping
the
drum,
it

moves
the
slide which COVERS
the air
bleed ports

more. With less air bleeding into the Servo, greater

vacuum exists
in it
and the diaphragm moves toward

the vacuum port opening
the
throttle wider.
The

tapered needle moves into the orifice further and the

diaphragm balances
in a
new position with the wider

throttle opening.
Car
speed
has
been maintained

automatically.

1.
Speedometer Cable

Adapter (From

Transmission)

2.
Gasket

3. Speedometer Cable

Adapter
(To

Speedometer)

4.
Adapter
and
Magnet

Housing

5. Rotating Magnet

6. Helical Ramp
7. Field Plate Adjusting

Pinion

8. Adjusting Pinion

Locating Spring

9. Brass Magnetically

Driven Disk

10.
Field Plate

11.
Hair Spring

12.
Hair Spring Keeper

13.
Rubber Drum

Tang
14.
Rubber Drum

1$.
"U"
Shaped Clutch

Spring

16.
Air
Bleed Sleeve

17.
Orifice Tube

18.
Orifice

19.
Orifice Tube Locknut

20.
Clutch
and
Solenoid

Housing

21.
Vacuum Supply Port

(To Servo)
22.
Vacuum Port (To

Intake Manifold)

23.
Vacuum Valve Slide

24.
Solenoid Coil

25.
Solenoid Plunger

Return Spring

26.
Solenoid Cover Gasket

27.
Air Filter

28.
Solenoid Cover

29.
Air Inlets

Fig.
9-
Regulator
-
Exploded

CHEVROLET CHASSIS SERVICE MANUAL