
Downloaded from www.Manualslib.com manuals search engine 4. After  you’ve  used  the  coolant  heater,  be sure to 
store  the cord  as it  was  before 
to keep  it  away 
from  moving  engine parts. If  you  don’t, 
it could 
be  damaged. 
How  long  should  you  keep the  coolant  heater  plugged 
in? The answer  depends 
on the  outside  temperature,  the 
kind 
of oil you have,  and so.me other  things.  Instead  of 
trying  to list  everything  here,  we  ask that 
you contact 
your 
GM dealer in the  area  where you’ll be  parking  your 
vehicle.  The dealer  can  give you the  best  advice  for  that 
particular  area. 
Automatic  Transmission  Operation 
. -- 
P RNDD 21 
There  are  several  different  positions  for your  shift  lever. 
If your  vehicle  is  equipped  with  an automatic 
transmission,  it  features  an  electronic shift  position 
indicator  within  the  instrument  cluster.  This  display 
must  be  powered  anytime 
the shift  lever is capable of 
being  moved out of the PARK (P) position.  This means 
that 
if your  key  is  in  the OFF position,  but  not  locked, 
there  will  be  a small  current  drain  on  your  battery  which 
could  discharge  your  battery  over a period 
of time.  If 
you need  to  leave your  key  in  the  ignition in the OFF 
position  for  an  extended  period,  it  is  recommended  that 
you disconnect the battery  cable from  the  battery to 
prevent  discharging  your  battery. 
PARK (P): This locks  your  rear  wheels.  It’s  the  best 
position 
to use  when  you  start  your  engine because  your 
vehicle  can’t move  easily. 
2-14   

Downloaded from www.Manualslib.com manuals search engine Turn Signals  When  Towing  a  Trailer 
When  you  tow a trailer,  your  vehicle  has  to  have  extra 
wiring  and  a heavy-duty  turn  signal  flasher (included 
in 
the  optional  trailering  package). 
The green  arrows  on your  instrument  panel  will  flash 
whenever  you  signal  a turn  or lane  change.  Properly 
hooked  up,  the  trailer lamps  will  also flash, telling other 
drivers  you’re  about  to turn,  change  lanes  or  stop. 
When  towing  a trailer,  the  green  arrows  on  your 
instrument  panel  will  flash for  turns  even  if the  bulbs  on 
the  trailer are  burned out. Thus,  you  may  think  drivers 
behind 
you are  seeing  your  signal when they  are  not.  It’s 
important 
to check  occasionally  to  be  sure  the  trailer 
bulbs  are still  working. 
Driving  On  Grades 
Reduce  speed  and  shift to a lower  gear before you start 
down  a long  or steep  downgrade.  If you  don’t  shift 
down, 
you might  have  to use  your  brakes so much  that 
they  would  get  hot  and  no longer work  well,  On 
a long  uphill  grade,  shift  down  and  reduce  your 
speed  to  around 
45 mph (70 kdh)  to  reduce  the 
possibility  of engine 
and transmission  overheating. 
If  you  have an automatic  transmission,  you should  use 
DRIVE (D) when  towing  a trailer.  Operating  your 
vehicle  in  DRIVE  (D)  when  towing  a trailer  will 
minimize  heat  buildup  and  extend  the  life  of your 
transmission.  Or,  if  you have a manual  transmission,  it’s 
better  not  to  use  FIFTH 
(5), just  drive in FOURTH (4) 
(or, as you  need to, a lower  gear). 
When  towing  at  high  altitude on steep uphill  grades, 
consider  the  following:  Engine  coolant  will  boil 
at a 
lower  temperature  than  at normal  altitudes.  If  you turn 
your  engine  off immediately  after towing  at  high  altitude 
on  steep 
uphill grades,  your  vehicle  may show  signs 
similar  to engine overheating.  To avoid  this, let  the 
engine  run  while  parked  (preferably  on level  ground) 
with  the  automatic  transmission  in  PARK 
(P) (or the 
manual  transmission  out  of gear  and  the  parking  brake 
applied) for 
a few  minutes  before  turning  the  engine off. 
If you do get the overheat  warning,  see “Engine 
Overheating’’ 
in the  Index. 
4-54   

Downloaded from www.Manualslib.com manuals search engine 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; 
0 Shift  into a gear;  and 
0 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  Wiring  Harness 
The  eight-wire  harness  is  stored  under  your  vehicle 
along 
the rear  frame  crossmember.  This harness  has a 
30-amp  feed  wire  with  an  inline fuse located  in  the 
instrument  panel  fuse block  and no  connector.  It  should 
be  wired  by  a qualified  electrical  technician.  The 
technician  can  use 
the following color code chart  when 
connecting  the  wiring  harness  to your  trailer. 
0 DARK BLUE: Use  for electric  trailer  brakes or 
0 RED: Use for battery  charging; it  connects to the 
LIGHT  GREEN: Back-up  lamps. 
0 BROWN: Taillamps  and  parking  lamps. 
0 YELLOW Left  stoplamp and  turn  signal. 
0 DARK  GREEN: Right stoplamp  and  turn  signal. 
0 WHITE  (Heavy  Gage): Ground  wire. 
0 WHITE (Light Gage): Auxiliary  stoplamp. 
Securely  attach  the  harness  to the trailer,  then  tape  or 
strap it  to your  vehicle’s  frame rail. Be sure 
you leave 
it  loose  enough 
so the  wiring  doesn’t  bend  or break, 
but  not  so 
loose that it drags on the ground.  Store the 
harness  in  its  original  place.  Wrap  the  harness  together 
and  tie 
it neatly so it  won’t  be  damaged. 
auxiliary  wiring. 
starter  solenoid. 
4-56   

Downloaded from www.Manualslib.com manuals search engine When you lift  the  hood,  you’ll see these items on the “VORTEC” 4300 engine: 
V 
I. Transmission  Dipstick 
3. Engine Oil Fill 
2. Brake Master Cylinder 
1. Coolant Recovery Tank 
:. Engine Oil  Dipstick 
6-9 
E Power Steering Reservoir 
G. Battery 
H. Air Cleaner 
I. Windshield  Washer Fluid   

Downloaded from www.Manualslib.com manuals search 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. 
Change  both  the  fluid and filter  every 
50,000 miles 
(83 
000 km)  if the  vehicle  is  mainly  driven  under  one or 
more 
of these  conditions: 
In  heavy  city  traffic  where the outside  temperature 
regularly  reaches  90°F (32°C)  or higher. 
0 In  hilly  or mountainous  terrain. 
0 When  doing  frequent trailer towing. 
0 Uses such as found in taxi,  police  or delivery  service. 
If  you  do  not  use  your  vehicle  under  any  of  these 
conditions,  the fluid  and filter  do not  require changing. 
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’s 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. 
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). 
0 At high  speed  for quite a while. 
0 In  heavy  traffic -- especially in hot  weather. 
0 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). 
6-16   

Downloaded from www.Manualslib.com manuals search engine 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 
pint. 
Don’t over-ZZ. 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. 
After  adding  fluid, recheck  the fluid level  as 
described  under “How to  Check.” 
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’s 
Service  Department. 
If you do it yourself,  be sure to follow  all the 
instructions  here, or you  could  get a  false  reading. 
I 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.   

Downloaded from www.Manualslib.com manuals search engine Fuse/Circuit  Usage Breaker 
7 Power  Auxiliary  Outlets, Assembly 
Line Diagnostic  Link 
8 
9 
10 
11 
12 
13 
14 
15 
Not  Used 
PCMNCM  Battery, 
ABS Battery, Fuel 
Pump (LN2) 
PCM/VCM Ignition, Injectors, Crank 
Sensor,  Coil  Driver Module 
Radio,  Inside Rearview Mirror 
Map  Lamp 
DRAC,  Anti-Lock  Braking System, 
Clock, Radio,  Battery, 
CD Player 
VCM 
IGN-3 
A/C  Compressor  Battery  Feed 
Daytime Running Lamps, 
Fog Lamps, 
Fog Lamp  Relay 
Fuse/Circuit  Usage  Breaker 
16 
17 
19 
20  21 
22 
24  Turn 
Signals  and Back-up 
Lamps,  Brake-Transmission 
Shift  Interlock  Solenoid 
Windshield  Washer,  Windshield  Wiper  Motor 
Electric  Shift Transfer Case 
Crank Signal,  Air  Bag System 
Cluster  Illumination, 
Radio  Illumination,  Heater 
Lamp,  Four-  Wheel-Drive 
Illumination,  Chime  Module, 
Fog  Lamp  Illumination 
Air  Bag System 
PRNDL  Power,  4L60E  Automatic 
Transmission 
6-65   

Downloaded from www.Manualslib.com manuals search engine Normal  Maintenance  Replacement  Parts 
Replacement  part numbers listed  in  this  section are  based  on  the  latest information  available at the  time of printing, 
and  are subject 
to change.  If a part listed  in  this  manual  is not  the same  as  the  part  used in your  vehicle  when it was 
built, 
or if  you  have any questions, please contact  your GM  truck  dealer. 
Engine 
Thermostat 
Oil  Filter 
Air  Cleaner Filter 
PCV  Valve  Automatic  Transmission  Filter Kit 
Spark Plugs 
Fuel  Filter 
Windshield  Wiper  Blades 
2.2L 
10  182377 
PF47 
A1163C 
cv9ooc  24200796 
4  1-928 
GF48 1 
Trico  (20  inched5 
1 cm) 
“VORTEC” 4300 
1255  1472 
PF52 
A1  163C 
CV746C  24200796 
4  1-932 
GF48  1 
Trico 
(20 inched5 1 cm) 
6-67