Hood Latches Check
Check that the hood closes firmly. Check for broken,
damaged, loose or missing parts that might prevent tight
latching. Make sure the secondary latch (if equipped)
keeps the hood from opening all the way when the
primary latch is released.
Fluid Leaks Check
Check for fuel, coolant, oil or other fluid leaks by looking
at the surface beneath the vehicle after it has been
parked for awhile.
Underbody Inspection
Corrosive materials used for ice, snow removal and dust
control can collect on the underbody. If these materials
are not removed, accelerated corrosion (rust) can
occur on underbody parts such as fuel lines, frame, floor
pan and exhaust system. At least every spring, flush
these materials from the underbody with plain
water. Take care to clean well any areas where mud
and other debris can collect. Sediment packed in closed
areas of the frame should be loosened before being
flushed.
Engine Cover Check
Check that the cab’s engine cover and seal (if equipped)
are not torn or damaged. Be sure that the cover is
clamped down firmly to the floor.
At Least Once a Year
Key Lock Cylinders Service
Lubricate the key lock cylinders with the lubricant
specified in Part C.
Underbody Flushing Service
At least every spring, use plain water to flush any
corrosive materials from the underbody. Take care to
clean thoroughly any areas where mud and other debris
can collect.
Tractor Protection (Breakaway) Valve
Check
On air brake models, remove, disassemble, clean and
inspect the tractor protection (breakaway) valve.
6-28
Just dial GM Medium Duty Truck Roadside Assistance
at 1-800-862-4389 to reach a qualified representative
who can assist you in a repair or arrange a tow. We also
provide dealer information at no charge, such as
location of the nearest authorized medium duty
GM Truck dealer and their hours of operation.
Roadside Assistance is available 24 hours a day,
7 days a week, 365 days a year, including weekends
and holidays. Should you have any questions about
Roadside Assistance, call the GM Medium Duty Truck
Roadside Assistance Center or contact your dealer.
Vehicle Data Collection and
Event Data Records
Your vehicle, like other modern motor vehicles, has a
number of sophisticated computer systems that monitor
and control several aspects of the vehicle’s
performance. Your vehicle uses on-board vehicle
computers to monitor emission control components to
optimize fuel economy, to monitor conditions for air bag
deployment and, if so equipped, to provide anti-lock
braking and to help the driver control the vehicle
in difficult driving situations. Some information may be
stored during regular operations to facilitate repair
of detected malfunctions; other information is stored only
in a crash or near crash event by computer systems
commonly called event data recorders (EDR).In a crash or near crash event, computer systems, such
as the Air Bag Sensing and Diagnostic Module (SDM)
in your vehicle may record information about the
condition of the vehicle and how it was operated, such
as engine speed, brake applications, throttle position,
vehicle speed, safety belt usage, air bag readiness, air
bag performance data, and the severity of a collision.
This information has been used to improve vehicle crash
performance and may be used to improve crash
performance of future vehicles and driving safety. Unlike
the data recorders on many airplanes, these on-board
systems do not record sounds, such as conversation of
vehicle occupants.
To read this information, special equipment is needed
and access to the vehicle or the SDM is required.
GM will not access information about a crash event or
share it with others other than
•with the consent of the vehicle owner or, if the
vehicle is leased, with the consent of the lessee,
•in response to an official request of police or similar
government office,
•as part of GM’s defense of litigation through the
discovery process, or
•as required by law.
7-5
Matching Transmitter(s) to Your Vehicle............... 2-5
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico and
U.S. Virgin Islands)....................................... 7-4
Mirrors
Manual Rearview Mirror................................2-39
Outside Convex Mirrors................................2-40
Outside Heated Mirrors................................2-41
Outside Manual Mirrors................................2-39
Outside Power Mirrors..................................2-40
Mirrors and Sun Visors Check..........................6-27
Model Reference................................................ vi
Moisture Ejector..............................................5-50
MyGMLink.com................................................ 7-3
N
New Vehicle Break-In......................................2-11
Noise Control System, Tampering......................5-62
Normal Maintenance Replacement Parts...........5-100
O
Odometer......................................................3-25
Off-Road Recovery..........................................4-14Oil
Change Engine Oil Light...............................3-39
Engine...............................................5-20, 5-25
Low Oil Level Light......................................3-38
Pressure Gage............................................3-37
Older Children, Restraints................................1-27
Online Owner Center........................................ 7-3
Other Service Items
Air Conditioning System...............................5-67
Automatic Ether Injection System...................5-66
Front Wheel Bearings with Oil-Filled Hubs.......5-67
Fuel Filter...................................................5-64
Primary Fuel Filter and Water Separator.........5-65
Secondary Fuel Filter and Water Separator/
Heater....................................................5-66
Other Warning Devices...................................... 3-6
Outlet Adjustment............................................3-22
Outside
Convex Mirrors............................................2-40
Heated Mirrors............................................2-41
Manual Mirrors............................................2-39
Power Mirrors.............................................2-40
Overdrive Defeat.............................................2-29
Overspeed Warning Light.................................3-39
Owners, Canadian............................................... ii
Owner’s Information.......................................... 7-8
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