GM Service Manual Online
For 1990-2009 cars only

Perform the following inspections and services at least twice a year. A dealer's service department or qualified service center should perform these inspections. All repairs should be completed at once.

Steering, Suspension and Front Drive Axle Boot Seal Inspection

    • Inspect the front suspension and the rear suspension. Refer to Suspension Component Inspection in Front Suspension.
    • Inspect the steering system for damaged, loose or missing parts, signs of wear, or lack of lubrication. Refer to Suspension Component Inspection in Front Suspension.
    • Inspect the power steering lines and the hoses for proper hook-up, binding, leaks, cracks, and chafing. Repair as needed. Refer to Power Steering System Inspection in Power Steering Systems.
    • Clean and inspect the drive axle boot seals for damage, tears, or leakage. Repair as needed.
       - For drive axle inner joint and seal replacement, refer to Wheel Drive Shaft Inner Joint and Boot Replacement in Wheel Drive Shafts.
       - For drive axle outer joint and seal replacement, refer to Wheel Drive Shaft Outer Joint and Boot Replacement in Wheel Drive Shafts.

Exhaust System Inspection

Inspect the complete exhaust system. Inspect the body near the exhaust system. Inspect for broken, damaged, missing, or out-of-position parts, open seams, holes, loose connections, or other conditions which may cause a heat build-up in the floor pan. These conditions could let exhaust fumes into the vehicle.

    • For exhaust system clearances, refer to Exhaust System Clearances in Engine Exhaust.
    • For exhaust leakage diagnosis, refer to Exhaust Leakage - Not OBD II in Engine Exhaust.
    • For exhaust noise diagnosis, refer to Exhaust Noise in Engine Exhaust.

Engine Cooling System Inspection

Inspect the hoses. Replace the hoses if the hoses are cracked, swollen, or deteriorated.

Inspect all pipes, fittings and clamps. Replace the components as needed.

    • For radiator inlet hose replacement, refer to Radiator Inlet Hose Replacement in Engine Cooling.
    • For radiator outlet hose replacement, refer to Radiator Outlet Hose Replacement in Engine Cooling.
    • For throttle body heater inlet hose replacement, refer to Throttle Body Heater Inlet Hose Replacement in Engine Cooling.
    • For heater hoses/pipes replacement, refer to Heater Hoses Replacement in Heating Ventilation and Air Conditioning.

Clean the outside of the radiator and air conditioning condenser. Inspect the front surface of the radiator and A/C condenser. Insects, leaves, debris, etc. may affect the performance of the radiator and A/C condenser.

If the front surface of either or both of these components needs cleaning, perform the following steps in order to remove the unwanted material:

    • Ensure that the engine is off, and cool.
    • Blow compressed air through the radiator from the rear surface of the radiator toward the front of the vehicle.
    • If compressed air is not available, use a water hose in order to force water through the radiator from the rear surface of the radiator toward the front of the vehicle.
    • In order to help ensure proper cooling system pressure performance, perform a pressure test of the cooling system and pressure cap at least once a year. Refer to Cooling System Leak Testing in Engine Cooling.
    • Pressure test the pressure cap. Refer to Pressure Cap Testing in Engine Cooling.

Throttle Linkage Inspection

Notice: Do NOT lubricate accelerator or cruise control cables. Lubrication will destroy the protective coating on these cables.

Inspect for the following conditions and replace the components as needed:

    • Missing parts, such as retainers or clips
    • Interference of linkage or cable conduit to critical components such as fuel lines, brake pipes or harness leads
    • Proximity of cable to exhaust system and other heat sources (check for melting and/or discoloration)
    • Cable kinking: Avoid sharp bends of the cables.
    • Clearance of throttle system moving parts throughout travel from other stationary components.
    • Damage of components due to cable kinking, severe abrasion or misalignment.

Brake System Inspection

Notice: A low brake fluid level can indicate worn disc brake pads which may need to be serviced. Also, if the brake system warning light stays on or comes on, something may be wrong with the brake system. If the anti-lock brake system warning light stays on or comes on, something may be wrong with the anti-lock brake system.

Inspect the complete system. Inspect the brake lines and the hoses for the following conditions:

    • Proper hookup
    • Binding
    • Leaks
    • Cracks
    • Chafing, etc.

Inspect the disc brake pads for wear. Inspect the surface condition of the rotors. Inspect all other brake parts, including the calipers, the parking brake, etc.

If driving habits or conditions result in frequent braking, inspect the brakes more often.