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The 1998 Pontiac  Bonneville  Owner’s  Manual 
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Seats  and  Restraint  Systems 
This section  tells  you  how  to  use  your  seats  and  safety  belts  prop\
erly.  It also explains  the “SRS” system. 
Features  and  Controls 
This section  explains  how  to  start  and  operate  your  vehicle. 
Comfort  Controls  and  Audio  Systems 
This section  tells  you  how  to  adjust  the  ventilation  and  comfort  co\
ntrols  and  how  to  operate  your  audio  system. 
Your  Driving  and  the  Road 
Here  you’ll  find  helpful  information  and  tips  about  the  road\
  and  how  to  drive  under  different  conditions. 
Problems  on  the  Road 
This section tells what to do if  you  have  a  problem  while  driving,  such  as a flat tire  or  overheated  engine, etc. 
Service  and  Appearance  Care 
Here  the  manual  tells you how  to  keep  your  vehicle  running  properly  and  looking  good. 
Maintenance  Schedule 
This section  tells  you  when  to  perform  vehicle  maintenance  and  what \
 fluids  and  lubricants  to  use. 
Customer  Assistance  Information 
This  section  tells  you  how  to  contact  Pontiac  for  assistance  a\
nd  how to get  service  and  owner  publications. 
It  also  gives  you  information 
on “Reporting  Safety  Defects”  on  page 8-10. 
9-1 Index 
Here’s an alphabetical  listing  of  almost  every  subject in this manual. You can  use  it to  quickly  find 
something  you  want 
to read. 
i  

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  transaxle  fluid  (don’t  overfill), 
engine  oil,  belt(s),  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 
Engine  Cooling  When  Ier Towing 
fight. 
- 
Your cooling  system  may  temporarily  overheat  during 
severe  operating  conditions.  See “Engine  Overheating” 
in  the  Index. 
4-38  

As shown in the  chart, SAE 1OW-30 is best  for  your 
vehicle.  However, 
you can  use SAE 5W-30 if it's  going 
to  be  colder 
than 60 "F (1 6" C)  before your next oil 
change. When it's very cold, you should  use SAE 
5W-30. These  numbers on an oil container show its 
viscosity, 
or thickness. Do not  use  other  viscosity  oils, 
such  as 
SAE 20W-50. 
NOTICE: 
Use only engine oil with  the  American  Petroleum 
Institute Certified For  Gasoline Engines 
"Starburst"  symbol.  Failure to use the 
recommended 
oil can result in engine damage 
not covered by your warranty. 
GM Goodwrench@  oil  meets all the  requirements  for 
your  vehicle. 
If you  are in an  area  where  the  temperature  falls  below 
-20°F (-29"C), consider  using  either an SAE 5W-30 
synthetic  oil  or an SAE OW-30 oil. Both  will  provide 
easier  cold  starting 
and better  protection  for  your  engine 
at  extremely  low  temperatures. 
Engine  Oil  Additives 
Don't  add  anything to your  oil.  Your  dealer  is ready  to 
advise  if  you 
think something  should  be  added. 
When to Change Engine Oil 
If  any  one of these is true  for  you,  use  the  short  tripkity 
maintenance  schedule: 
0 
0 
0 
0 
0 
Most  tsips  are  less  than 5 to 10 miles (8 to 16 lun). 
This is  particularly  important  when  outside 
temperatures  are  below  freezing. 
Most 
trips include  extensive  idling  (such  as  fiequent 
driving 
in stop-and-go traffic). 
Most trips are through dusty areas. 
You  frequently  tow  a  trailer  or  use  a  carrier  on  top  of 
your  vehicle. 
The  vehicle 
is used for delivery  service,  police, taxi 
or  other  commercial  application. 
Driving  under  these  conditions  causes  engine  oil  to 
break  down  sooner. 
If any  one of these  is true  for  your 
vehicle, 
then you  need  to  change  your oil and  filter 
every 
3,000 miles (5 000 km) or 3 months -- whichever 
occurs 
first. 
6-16  

If none  of them  is true,  use  the long  triphighway 
maintenance  schedule.  Change  the  oil  and  filter  every 
7,500 miles (12 500 km) or 12 months -- whichever 
occurs  first.  Driving  a  vehicle  with  a  fully  warmed 
engine  under  highway  conditions  causes  engine  oil to 
break  down  slower. 
What  to Do with Used Oil 
Did  you  know  that  used  engine  oil  contains  certain 
elements  that  may  be  unhealthy  for your 
skin and  could 
even  cause  cancer?  Don’t  let  used  oil  stay  on  your  skin 
for  very  long.  Clean  your 
skin and  nails  with  soap  and 
water,  or  a 
good hand  cleaner.  Wash  or  properly  throw 
away  clothing  or  rags  containing  used  engine  oil.  (See 
the  manufacturer’s  warnings  about  the  use  and 
disposal 
of oil products.) 
Used oil can  be  a  real  threat  to the  environment. If you 
change  your  own  oil,  be  sure  to  drain  all  free-flowing  oil 
from 
the filter  before  disposal.  Don’t ever dispose of oil 
by  putting  it  in  the trash,  pouring  it on  the  ground,  into 
sewers,  or  into  streams  or bodies  of  water.  Instead, 
recycle 
it by  taking it to  a  place  that  collects  used oil. If 
you  have  a  problem  properly  disposing  of  your  used  oil, 
ask  your  dealer,  a  service  station  or  a  local  recycling 
center  for 
help. 
Air Cleaner 
The  air  cleaner  and  filter  are  on  the driver’s  side  of the 
engine  compartment. 
1. Remove  the  screws  on  the air  cleaner  housing  cover. 
6-17  

2. Remove  the  air  intake  hose  that  is  fitted  over  the 
throttle  body  by  pulling  the  hose  upward  and  away 
from the  throttle  body  which  is  located  near  the  top 
of  the  engine. 
3. Disconnect  the  electrical 
connector  which  is 
attached  to  the  air 
temperature  sensor 
located  in  the  hose. 
This will  allow  you  to 
lift 
the rear  portion  of 
the  air  cleaner. 
4. After  detaching  the  hose from the  throttle  body  and 
disconnecting  the  electrical  connector,  pull  back  the 
entire  rear  portion  of the  air  cleaner  by  pulling 
upward  and  rearward. 
5. Replace  the air filter. 
6. Reinstall  the  rear  section of the air cleaner. 
7. Reconnect  the  electrical  connector. 
8. Reattach  the  air  intake  hose. 
Refer  to  the  Maintenance  Schedule 
to determine  when  to 
replace  the 
air filter. 
See  “Scheduled  Maintenance  Services”  in the Index. 
6-18  

How to Check and Add Oil 
Check  oil  only  when the engine  is  cold.  Allow  the 
engine 
to cool two  to  three  hours  after  running. 
If you  remove  the  supercharger oil €ill plug  while 
the  engine 
is hot,  pressure  may  cause  hot oil to 
blow  out 
of the oil fill hole. You may  be  burned. 
Do not  remove  the  plug  until  the  engine  cools. 
1. Clean  the  area  around  the  oil fill plug  before 
2. Remove  the  oil fill plug  using a 3/16 inch 
3. The oil  level  is  correct  when  it just  reaches  the 
bottom of the  threads of the  inspection  hole. 
4. Replace the oil plug  with  the O-ring  in place. 
Torque  to 
88 lb-in (10 N-m). 
removing  it. 
Allen  wrench. 
Automatic  Transaxle Fluid 
When to Check and  Change 
A good  time  to check  your  automatic  transaxle  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: 
0 In heavy  city  traflic where  the outside  temperature 
regularly  reaches 
90°F (32°C) or  higher. 
In hilly  or mountainous  terrain. 
0 When  doing  frequent  trailer  towing. 
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  Pontiac  dealership 
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. 
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2. Push it back  in all the  way,  wait  three  seconds  and 
then  pull  it back  out  again. 
3. Check  both  sides of the  dipstick,  and  read the 
lower  level. The fluid level must be in the 
cross-hatched  area. 
4. If the fluid  level  is  in  the  acceptable  range,  push 
the  dipstick  back  in  all  the  way. 
How to Add Fluid 
Refer  to the Maintenance  Schedule  to  determine  what 
kind 
of transaxle fluid to use.  See  “Recommended 
Fluids  and  Lubricants”  in  the  Index. 
If the fluid  level  is low,  add  only  enough of the  proper 
fluid  to  bring  the  level  into the  cross-hatched  area  on 
the  dipstick. 
1. Pull  out  the  dipstick. 
2. Using  a  long-neck  funnel,  add  enough  fluid  at  the 
dipstick  hole  to  bring  it to 
the proper  level. 
It  doesn’t  take  much  fluid,  generally  less  than  one 
pint 
(0.5 L). Don’t oveflll. 
~ 
NOTICE: 
We recommend you use only fluid  labeled 
DEXRON@-III, because  fluid with that  label is 
made especially for your automatic transaxle. 
Damage corused by fluid  other  than DEXRON-111 
is not  covered by your new  vehicle warranty. 
3. After  adding  fluid,  recheck  the fluid level  as 
described  under  “HOW  to  Check.” 
4. When  the  correct  fluid  level is obtained,  push  the 
dipstick  back 
in all the way. 
6-22  

Tire Inspection  and Rotation 
Tires  should  be  rotated  every 6,000 to 8,000 miles 
(10 OOO to 13 OOO km). Any  time  you  notice  unusual 
wear,  rotate  your  tires  as  soon  as possible  and  check 
wheel  alignment. 
Also check  for damaged  tires  or  wheels. 
See “When It’s Time  for  New  Tires”  and  “Wheel 
Replacement”  later  in 
this section  for  more  information. 
The  purpose  of regular  rotation  is  to  achieve  more 
uniform  wear  for  all tires  on  the vehicle.  The first 
rotation  is  the  most  important.  See  “Scheduled  Maintenance  Services”  in  the  Index  for scheduled 
rotation  intervals. 
m4 
 
Don’t  include  the  compact  spare  tire  in your tire rotation. 
After  the  tires  have  been  rotated,  adjust  the front 
and  rear  inflation  pressures  as shown 
on the 
Tire-Loading  Information  label.  Make  certain  that  all  wheel  nuts 
are properly  tightened.  See “Wheel 
Nut  Torque”  in  the Index. 
A CAUTION: 
Rust  or  dirt  on  a  wheel, or on  the parts to  which 
it  is  fastened,  can  make  wheel  nuts  become  loose 
after  a  time.  The  wheel  could  come 
off and  cause 
an  accident.  When  you  change  a  wheel,  remove 
any rust or dirt from places where the wheel 
attaches  to  the  vehicle. In an  emergency,  you  can 
use  a  cloth  or 
a paper towel to do  this;  but be 
sure  to  use  a  scraper  or wire  brush  later, 
if you 
need  to,  to  get  all  the rust  or  dirt 
off. (See 
“Changing  a  Flat Tire”  in the  Index.) 
I 
When  rotating  your  tires,  always  use  the  correct  rotation 
pattern  shown  here. 
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