
What  can you do about  highway  hypnosis?  First,  be  aware  that  it  can 
happen. 
Then  here  are some  tips: 
0 Make  sure  your  vehicle  is well  ventilated,  with  a  comfortably  cool 
Keep  your  eyes  moving.  Scan  the  road  ahead  and to the  sides.  Check 
interior. 
your  mirrors  and  your  instruments  frequently. 
If you get sleepy, pull off the  road  into  a  rest,  service,  or  parking  area 
and  take  a  nap, get  some  exercise,  or  both.  For  safety, treat drowsiness 
on  the  highway  as  an emergency. 
Hill  and  Mountain  Roads 
I 
Driving  on  steep  hills  or mountains  is different  from  driving in  flat  or 
rolling  terrain. 
If  you  drive regularly  in steep  country,  or 
if you’re  planning  to  visit there, 
here  are  some  tips  that  can  make  your  trips safer  and more  enjoyable.  (See 
“Off-Road  Driving” in the  Index  for  information  about  driving  off-road.) 
Keep  your  vehicle in good  shape.  Check all fluid  levels  and  also the 
brakes,  tires,  cooling  system  and  transmission.  These  parts  can \
 work 
hard  on  mountain  roads. 
Know  how to go down  hills. The most  important  thing to know  is  this: 
let  your  engine  do  some  of the  slowing  down.  Shift  to a  lower  gear 
when you  go  down  a  steep  or  long  hill. 
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When You Are  Ready to Leave  After  Parking  on a Hill 
1. Apply  your  regular  brakes and hold  the pedal down  while you: 
Start  your  engine: 
Shift  into a  gear;  and 
Release  the  parking  brake. 
2. Let up on the brake  pedal. 
3. Drive slowly until the trailer is clear  of the  chocks. 
4. Stop  and have  someone pick up and store  the chocks. 
Maintenance  When  Trailer  Towing 
Your  vehicle will need service more often  when you’re  pulling a trailer. See 
the  Maintenance  Schedule 
for more on this.  Things that are especially 
important 
in trailer  operation  are  automatic transmission  fluid  (don’t 
overfill),  engine  oil,  axle lubricant,  belt, cooling  system,  and brake 
adjustment.  Each  of these  is covered 
in this manual, and the Index will  help 
you  find them quickly.  If you’re trailering,  it’s 
a good idea to review  these 
sections  before you start your  trip. 
Check  periodically  to  see that all  hitch 
nuts and bolts  are tight. 
Trailer  Lighting  Systems  Wiring 
See “Trailer Wiring  Harness” in the Index. 
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You could  be injured if the vehicles roll.  Set the parking brake firmly 
on each  vehicle.  Put an automatic transmission in PARK (P) or a 
manual  transmission in NEUTRAL (N). If you have a 
four-wheel-drive  vehicle, be sure  the transfer  case is  not in NEUTRAL 
(N). 
3. Turn  off  the  ignition on both vehicles. Turn  off all lights that  aren’t 
needed, and radios.  This 
will avoid sparks and help save both batteries. 
And  it could  save your radio! 
NOTICE: 
If you  leave  your radio  on, it could  be  badly  damaged. The 
repairs  wouldn’t  be  covered  by your warranty. 
4. Open  the hoods and locate the batteries.  Find the positive (+) and 
negative 
(-) terminals on each battery. 
A CAUTION: 
Using  a match  near a battery  can cause battery gas  to  explode. 
People  have been hurt doing  this, and some  have  been  blinded. 
Use 
a flashlight if you  need  more light. 
Be  sure  the batteries  have enough 
water. You don’t  need  to  add 
water to  the Delco Freedom@  battery (or batteries)  installed in 
every  new 
GM vehicle.  But if a battery  has filler  caps,  be sure 
the  right  amount of fluid  is  there. 
If it is low,  add water to take 
care 
of that  first. If you don’t,  explosive  gas could  be  present. 
Battery  fluid contains acid  that can burn  you.  Don’t  get 
it on 
you. 
ff you  accidentally  get it in your  eyes or on your  skin,  flush 
the place  with water  and get  medical  help immediately. 
5. Check  that the jumper  cables don’t have  loose or missing insulation.  If 
they  do, 
you could get  a shock.  The vehicles  could be damaged, too. 
Before you  connect the cables,  here are  some basic things  you should 
know. Positive 
(+) will go to  positive (+) and negative (-) will  go  to 
negative 
(-) or a metal  engine  part. Don’t  connect (+) to (-) or you’ll 
get 
a short that would  damage the battery and maybe  other parts, too. 
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To remove the air  cleaner  filter  on a 6.5 liter turbocharged  diesel  engine, 
first  remove  the rubber  elbow.  Remember  to observe the caution  about 
turbocharger  blades on the rubber elbow. 
Then, unhook the 
cover  retaining  clips 
and  push  the rear 
of 
the cover  toward the 
engine. 
Automatic Transmission Fluid 
When to Check  and  Change 
A good  time  to  check  your  automatic transmission  fluid  level  is  when the 
engine 
oil is  changed.  Refer to the Maintenance  Schedule to determine 
when  to  change  your  fluid.  See  "Scheduled Maintenance  Services'' 
in the 
Index. 
How to Check 
Because  this  operation  can be  a little difficult, you may  choose to have this 
done  at your 
GM dealer  Service  Department. 
If  you  do 
it yourself,  be sure  to follow all the  instructions  here, or you could 
get 
a false  reading  on the  dipstick. 
NOTICE: 
Too much  or  too  little  fluid  can  damage  your  transmission. Too 
much  can mean  that  some of the  fluid  could  come  out  and  fall  on 
hot  engine  parts  or  exhaust  system  parts,  starting  a  fire.  Be \
 sure 
to  get  an accurate  reading  if  you  check  your  transmission  fluid. 
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Wait at least  30 minutes before  checking the transmission fluid  level if you 
have been driving: 
When  outside temperatures  are  above 90°F (32°C). 
At high speed for quite a while. 
In  heavy traffic - especially in hot  weather. 
While pulling a trailer. 
To get the right reading.  the fluid should  be  at  normal  operating 
temperature,  which  is 180°F to 200°F 
(82°C to 93°C). 
To check transmission  fluid  hot: Get  the vehicle warmed  up by  driving 
about 
15 miles (24 km)  when outside temperatures are above  50°F  (10°C). 
If it's  colder than 50°F (lO"C), drive the vehicle  in DRIVE (3) until the 
engine  temperature  gage moves  and then remains steady  for ten  minutes. 
Then  follow the  hot check procedures. 
To check transmission  fluid cold: A cold check  is made  after the vehicle 
has  been sitting for eight hours  or more 
with the  engine  off  and  is  used only 
as a reference.  Let  the engine run at idle for five minutes if outside 
temperatures  are  50°F 
(10°C) or more. If it's  colder than  50°F (IOOC), you 
may  have  to idle  the engine  longer. Should  the fluid  level  be  low during  a 
cold  check,  you 
must perform a hot check before adding fluid.  This will 
give you a more accurate reading  of the fluid  level. 
To check the fluid hot or cold 
Park your vehicle on a level place.  Keep  the engine  running. 
With the parking brake  applied, place the shift lever in PARK (P). 
With your foot on the brake  pedal,  move the shift lever through each 
gear  range,  pausing for about three seconds 
in each range.  Then, 
position  the shift lever 
in PARK  (P). 
Let the engine  run  at idle for three  minutes  or more. 
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How to Add Fluid 
Refer to the  Maintenance  Schedule  to  determine what kind of transmission 
fluid 
to use.  See “Recommended  Fluids and Lubricants”  in  the Index. 
Add  fluid only after  checking the transmission fluid 
HOT. (A COLD  check 
is used 
only as  a reference.)  If the fluid level  is  low,  add only enough of the 
proper  fluid to bring the level  up 
to the HOT area for a hot  check.  It doesn’t 
take  much  fluid, generally  less than  a 
int. Don ’t overfill. We recommend 
you use only fluid labeled  DEXRON 
-111, because fluid with that label is 
made  especially  for  your  automatic  transmission.  Damage caused  by fluid 
other  than DEXRON@-I11  is  not  covered by your 
new vehicle  warranty. 
8 
0 After adding  fluid, recheck  the fluid level as described under “How  to 
Check.” 
0 When the correct  fluid level is obtained,  push the dipstick back in all 
the way; then  flip the handle down 
to lock the dipstick in place. 
Manual  Transmission  Fluid 
When to Check 
A good  time  to have it checked is when the engine  oil is changed.  However, 
the  fluid 
in your manual transmission doesn’t require  changing. 
How to Check 
Because this operation  can be  a little difficult, you may  choose to have  this. 
done  at your 
GM dealer  Service  Department. 
If you do it yourself,  be sure  to follow all the instructions  here,  or you  could 
get  a  false  reading. 
NOTICE: 
Too much  or  too  little  fluid  can  damage  your  transmission. Too 
much can  mean  that  some  of  the  fluid  could  come  out  and  fall  on 
hot  engine  parts  or  exhaust  system  parts,  starting  a  fire. 
Be sure 
to get  an accurate  reading  if you check  your  transmission  fluid. 
Check  the  fluid level only when your  engine is off, the vehicle  is parked on 
a level  place  and the transmission is cool enough for you to rest your fingers 
on the transmission  case. 
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Every 50,000 Miles (83 000 km) 
Automatic Transmission Service 
Every 60,000 Miles (100 000 km) 
Crankcase Depression Regulator  Valve (CDRV)  System Inspection 
Engine  Accessory  Drive Belt Inspection 
Exhaust  Gas Recirculation  (EGR) System Inspection 
(if equipped) 
Exhaust Pressure Regulator  Valve Inspection 
Maintenance  Schedule I - Gasoline  Engines  With 
Light 
Duty Emissions 
The services  shown in this  schedule up to 60,000 miles (1 00 000 km)  should 
be  performed  after 
60,000 miles (100 000 km) at the  same  intervals. 
Footnotes 
3 The  California  Air Resources  Board has determined that the  failure  to 
perform  this maintenance  item  will not nullify  the emission warranty  or 
limit  recall  liability prior  to the completion  of vehicle useful life.  We, 
however,  urge that all recommended  maintenance services  be performed at 
the indicated  intervals and the maintenance  be recorded. 
:$* Drive  axle  service: 
Locking Differential - Drain fluid and refill at  first  engine oil change. 
At  subsequent oil  changes, check fluid  level and add fluid 
as needed. If 
driving in dusty areas  or towing a trailer, drain fluid and  refill every 
15,000 miles (25 000 km). 
0 Standard  Differential - Check fluid  level and add fluid as needed  at 
every  oil change. 
If driving in dusty  areas  or towing  a trailer, drain 
fluid and refill every 15,000 miles (25 000 km). 
More  frequent  lubrication  may  be required  for heavy-duty  or off-road 
use. 
3500 HD  Models  with applications requiring  extreme overload/trailer 
towing  conditions  and high  speed (above 
45 mph or 72 kmh) 
conditions  for extended  periods of time must have the  drive  axle fluid 
changed  every 
3,000 miles (5 000 km) or 3 months, whichever  occurs 
first,  or must  use 
75W-140 synthetic fluid meeting GM specifications. 
See  “Recommended Fluids and Lubricants” 
in this  section. 
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Maintenance  Schedule I - Gasoline  Engines  With 
Light  Duty  Emissions 
3,000 Miles (5 000 km) 
[7 Change  engine  oil  and filter  (or every 3 months, whichever  occurs 
first). 
An Emission Control Sen7ic.e. 
0 Lubricate the front  suspension, king  pin bushings,  steering linkage, 
transmission  shift linkage. transfer  case  shift linkage, parking  brake 
cable guides, rear driveline  center splines. front  axle propshaft  splines. 
brake pedal  springs and clutch  pedal springs.  Ball joints  and king  pin 
bushings should  not  be  lubricated  unless their temperature is 
10" F 
(-1 2" C), or higher. When  weather  is cold, let the  ball -joints and king 
pin  bushings  warm up before  lubrication  or they  could be damaged. 
Perform  each  of  the  listed lubrication  service items  at this mileage 
interval  (or every 
6 months, whichever  occurs  first). 
C Check rear/front axle fluid  level  and add -fluid as needed. Check 
constant  velocity  joints  and 
axle seals for leaking. *'* 
DATE SERVICED BY: ACTUAL MILEAGE I 
6,000 Miles (10 000 km) 
iI Change  engine  oil and  filter  (or every 3 months, whichever  occurs 
first). 
AI? Emission Confro1 Ser\lic.e. 
Lubricate  the front  suspension, king  pin bushings,  steering linkage, 
transmission  shift linkage, transfer case  shift linkage,  parking brake 
cable  guides,  rear driveline  center splines, front axle propshaft  splines. 
brake  pedal springs  and clutch  pedal  springs.  Ball joints  and king  pin 
bushings  should  not  be  lubricated  unless  their temperature 
is 10" E 
(,-12" C), or higher. When weather is cold, let the ball  joints and king 
pin  bushings  warm up  before lubrication 
or they could  be damaged. 
Perform each of the  listed  lubrication  service items at  this  mileage 
interval  (or every 
6 months, whichever  occurs  first). 
0 Check  readfront axle fluid level and  add fluid as needed. Check 
constant velocity  joints and axle seals  for leaking. 
*'$ 
(Contiwed) 
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