GM Service Manual Online
For 1990-2009 cars only

The following information covers the inspections and services required in order to retain the safety, dependability, and emission control performance of the vehicle.

Immediately complete all of the necessary repairs. Add only the recommended fluids or lubricants to the vehicle.

At Each Fuel Fill

Perform the following underhood inspections at each fuel fill. Refer to Fluid and Lubricant Recommendations .

Engine Oil Level

Inspect the engine oil level. Add the proper oil if necessary. In order to select the proper fluids and lubricants, refer to Fluid and Lubricant Recommendations .

Engine Coolant Level

Inspect the engine coolant level. Add DEX-COOL ® for the proper coolant if necessary. Refer to Cooling System Draining and Filling in Engine Cooling.

In order to select the proper fluids and lubricants, refer to Fluid and Lubricant Recommendations .

Windshield Washer Fluid Level

Inspect the windshield washer fluid level in the windshield washer reservoir. Add the proper fluid if necessary. Refer to Fluid and Lubricant Recommendations .

At Least Once a Month

Tire Inflation

Inspect tire inflation. Ensure that the tires are inflated to the pressures specified on the Certification/Tire label located on the driver's door lock pillar. Refer to Tire Inflation Pressure Specifications .

Cassette Deck Service

Clean the cassette deck. Perform cassette deck cleaning every 50 hours of cassette tape play. Refer to Cassette Player Care and Cleaning in Entertainment.

At Least Twice a Year

Restraint System Check

Ensure that the seat belt reminder light and all the belts, buckles, latch plates, retractors and anchorages are working properly. Inspect for any loose or damaged safety belt system components. Repair any loose or damaged safety belt system components. Replace any torn or frayed safety belts.

For seat belt diagnosis information, refer to Operational and Functional Checks in Seat Belts.

Inspect for any opened or broken supplemental inflatable restraint (SIR) covers. (The SIR system does not need regular maintenance.)

For diagnosis, refer to Diagnostic Starting Point in SIR.

Wiper Blade Check

Inspect the wiper blades for wear or cracking. Replace any blade inserts that appear worn, cracked, damaged, or that streak or miss areas of the windshield. Refer to Wiper Blade Element Replacement in Wipers/Washer System.

Weatherstrip Lubrication

Silicone grease on weatherstrips will help to increase the life of the weatherstrip, seal better, and not stick or squeak. Apply silicone grease with a clean cloth. During very cold, damp weather, more frequent application may be required. Refer to Fluid and Lubricant Recommendations for the proper type of lubricant. Colder, more damp climates, will require more frequent applications.

Automatic Transaxle Check

Inspect the transmission axle fluid level. Add fluid, if needed. Refer to Fluid and Lubricant Recommendations .

A fluid loss may indicate a problem. Inspect the system, and repair if needed.

Refer to Transmission Fluid Check in Automatic Transaxle - 4T65-E. If fluid was added, refer to Fluid Leak Diagnosis in Automatic Transaxle - 4T65-E.

At Least Once a Year

Key Lock Cylinders Service

Lubricate the lock cylinders using the recommended lubricant. Refer to Fluid and Lubricant Recommendations for the proper type of lubricant.

Body Lubrication Service

Lubricate all of the following areas:

    • The body door hinges
    • The body hood, safety lever, and prop rod pivot
    • The fuel door
    • The rear compartment hinges
    • The rear compartment latches and locks
    • The instrument panel compartment hinges, latch, and lock cylinder
    • The console cover hinges and latch
    • The seat hardware

More frequent lubrication may be required when a vehicle is exposed to a corrosive environment. Refer to Fluid and Lubricant Recommendations for the proper type of lubricant.

Starter Switch Check

    Caution: When performing this check, the vehicle could move suddenly. Personal injury or property damage may result. Make sure there is enough room around the vehicle, in case the vehicle does move. Do not use the accelerator pedal, and be ready to turn OFF the engine immediately if it starts.

  1. Before you start, ensure that you have enough room around the vehicle.
  2. Important: Do not use the accelerator pedal, and be ready to immediately turn off the engine if the engine starts.

  3. Firmly apply both the park brake and the regular brake.
  4. Try to start the engine in each gear. The starter should work only in PARK (P) or NEUTRAL (N). If the starter works in any other position, your vehicle needs service. Refer to Automatic Transmission Shift Lock Control Inoperative in Automatic Transmission/Transaxle - 4T65-E.

Automatic Transmission Shift Lock Control Check

    Caution: When performing this check, the vehicle could move suddenly. Personal injury or property damage may result. Make sure there is enough room around the vehicle, in case the vehicle does move. Be ready to apply the regular brake immediately should the vehicle begin to move.

  1. Before you start, ensure that you have enough room around the vehicle. Park the vehicle on a level surface.
  2. Important: Be ready to immediately apply the regular brake if the vehicle begins to move.

  3. Firmly apply the parking brake.
  4. With the engine off, turn the key to the RUN position. Do not start the engine.
  5. Without applying the regular brake, try to move the shift lever out of PARK (P) with normal effort.
  6. If the shift lever moves out of PARK (P), the automatic transmission shift lock control needs service. Refer to Automatic Transmission Shift Lock Control Inoperative in Automatic Transmission/Transaxle - 4T65-E.

Ignition Transaxle Lock Check

  1. With the vehicle parked, set the parking brake.
  2. Insert the ignition key into the ignition lock cylinder and turn the ignition lock cylinder to OFF.
  3. Move the transmission shifter to REVERSE.
  4. Try to turn the ignition lock cylinder to LOCK.
  5. Repeat Steps 3 and 4 with the transmission shifter in every possible position. If the ignition lock cylinder turns to LOCK when the transmission shifter is in ANY position other than PARK, repair the park lock system. Refer to Automatic Transmission Shift Lock Control Inoperative in Automatic Transmission/Transaxle - 4T65-E.
  6. Turn the ignition lock cylinder to OFF.
  7. Try to remove the key from the ignition lock cylinder.
  8. Repeat Steps 6 and 7 with the ignition lock cylinder in every possible position. If the key comes out of the ignition lock cylinder in ANY position other than LOCK, repair the system. Refer to Automatic Transmission Shift Lock Control Inoperative in Automatic Transmission/Transaxle - 4T65-E.

Park Brake and Automatic Transaxle Park (P) Mechanism Check

    Caution: When performing this check, the vehicle could begin to move. Personal injury or property damage may result. Make sure there is enough room in front of the vehicle, in case the vehicle begins to roll. Be ready to apply the regular brake immediately should the vehicle begin to move.

  1. Ensure that the vehicle is parked on a fairly steep hill with the vehicle facing downhill.
  2. Keep the regular brake firmly engaged while setting the park brake.
  3. Perform the following procedure in order to test the holding ability of the park brake:
  4. • Ensure that the engine is running.
    • Ensure that the transmission is in the NEUTRAL (N) position.
    • Slowly remove foot pressure from the regular brake pedal.
    • Do this until the vehicle is held by the park brake only.
  5. If the parking brake fails to hold the vehicle, repair the system. For shoe adjustment, refer to Parking Brake Shoe Adjustment in Park Brake. For cable adjustment, refer to Park Brake Cable Service/Adjustment in Park Brakes.
  6. Perform the following procedure in order to test the holding ability of the PARK (P) mechanism's holding ability:
  7. 5.1. Ensure that the engine is running.
    5.2. Shift to PARK (P).
    5.3. Release all of the brakes.

If the park mechanism fails to hold the vehicle, repair the system.

Refer to No Park Range in Automatic Transmission/Transaxle - 4T65-E.

Underbody Flushing Service

At least every spring season, use plain water in order to flush any corrosive materials from the underbody. Thoroughly clean any areas where mud and other debris may collect.