Air Conditioning; Body Lubrication - Chevrolet 1979 Light Duty Truck Owner's Manual

Air Conditioning

Have your Dealer check your Air Conditioning system at some tim e
during the winter months to be sure there has been no loss in cooling
output. During the summer, see your Dealer immediately if you
suspect the system is not performing as it should.
The system will not operate below ambient temperatures of 40"F (4•C)
regardless of control position.

Body Lubrication

Normal use of a vehicle causes metal-to-metal movement at certain
points in the cab or body. Noise, wear and improper operation at these
points will result when a protective film of lubricant is not provided.
For exposed surfaces, such as door checks, door lock bolts, lock striker
plates, dovetail bumper wedges, etc., apply a thin film of light engine
oil.
Where oil holes are provided in body parts a dripless oil can be safely
used, but any lubricant should be used sparingly, and after application
all excess should be carefully wiped off.
The seat adjusters and seat track, ordinarily overlooked, should be
lubricated with water resistant EP chassis lubricant which meets
General Motors Specification GM 603 1M.
There are other points on bodies which may occasionally require
lubrication and which are difficult to service. Window regulators and
controls are confined in the space between the upholstery and the
outside door panel. Easy access to the working parts may be made by
removing the trim. Door weatherstrips and rubber hood bumpers
should be lightly coated with a rubber lubricant.
Four Wheel Drive
Most lubrication recommendations and procedures for four wheel
drive-equippeC;I vehicles are the same for corresponding components of
conventional drive vehicles.
In addition, the following items require lubrication as follows:
Tra nsfer Case
Check the transfer case level at the interval shown in the Maintenance
Schedule and if necessary, add lubricant as follows:
Conventional Four Wheel Drive -
GL-5 gear lubrican ! to bring to level of filler plug hole.
Full Time Four Wheel Drive -
oil to bring to level l/2 inch below filler plug hole. Drain and refill
transfer case as shown in the chart below if Full Time Four Wheel
Drive vehicles are used under these conditions.
Change
Oil
ntervai-Miles)
(I
24,000
1 2,000
1 ,000
Daily
Normal On-Off Road
Heavy Duty Work, Trai ler Towing, Snowplowing, etc
Severe Usage; Heavy Mud, Min ing, Sa nd Du nes, iltc.
Severe Usage with Transfer Case Sub merged.
5-12
Add SAE SOW or SAE SOW -90
Add SAE IOW-30 or lOW-40 engine
Type of Operation