CTS 2003-2005

Maintenance Intervals

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MAINTENANCE I AND II SERVICE SCHEDULES
Cadillac CTS
ServiceMaintenance IMaintenance II
Change the engine oil and filter.XX
Reset the oil life system.    
Visually inspect the vehicle for leaks or damage. A fluid loss in the vehicle system could indicate a problem. Inspected, repair and add fluid to the system if necessary.XX
Inspect the engine air cleaner filter. If necessary, replace the filter.XX
Inspect the engine air cleaner filter. If necessary, replace the filter.XX
  XX
Rotate the tires. Inspect the tire inflation pressures and the tire wear.XX
  XX
  XX
Visually inspect the brake lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc. Inspect the disc brake pads for wear and the rotors for surface condition. Inspect the drum brake linings for wear or cracks. Inspect other brake partsXX
Inspect the engine coolant and the windshield washer fluid levels. Add fluid as needed.XX
Inspect the suspension and steering components. Inspect the front and rear suspension and the steering system for damaged, loose or missing parts, or signs of wear. Inspect the power steering lines and the hoses for proper hook-up, binding, leaks, crac--X
  --X
    X
Visually inspect the coolant hoses and replace the hoses if they are cracked, swollen or deteriorated. Inspect all pipes, fittings and clamps; replace with GM parts as needed. To help ensure proper operation, a pressure test of the cooling system and p   X
Inspect the wiper blades.--X
Inspect the wiper blades for wear or cracking.    
Inspect the restraint system components.--X
Ensure the safety belt reminder light and all the belts, buckles, latch plates, retractors and anchorages are working properly. Look for any other loose or damaged safety belt system parts. If you see anything that might keep a safety belt system from    
Lubricate the body components.--X
Lubricate all key lock cylinders, hood latch assemblies, secondary latches, pivots, spring anchor and release pawl, hood and door hinges, rear folding seats and liftgate hinges. Frequent lubrication may be required when exposed to a corrosive environme    
Inspect the transaxle fluid level and add fluid as needed.--X
Inspect the suspension and steering components.--X
    X
Inspect the front and rear suspension and the steering system for damaged, loose or missing parts, or signs of wear. Inspect power steering lines and hoses for proper hook-up, binding, leaks, cracks, chafing, etc.   X
Inspect the throttle system.--X
    X
Inspect the throttle system for interference or binding and for damaged or missing parts. Replace the parts as needed. Replace any components that have high effort or excessive wear. Do not lubricate the accelerator or the cruise control cables.   X
Replace the passenger compartment air filter.--X
    X
Replace the passenger compartment air filter.   X
1Required services are described as MaintenanceI and MaintenanceII.
2Alternate between the 2thereafter. However, in some cases, MaintenanceII may be required more often.
3MaintenanceI:Use MaintenanceI if the CHANGE ENGINE OIL light comes on within 10months since vehicle
4was purchased or, if Maintenance II was performed.
5MaintenanceII:Use MaintenanceII if the previous service performed was MaintenanceI. Always use
6Maintenance II when the CHANGE ENGINE OIL light comes on 10 months or more since the last service,
7or, if the CHANGE ENGINE OIL light has not come on at all for one year.


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Fig. Maintenance Intervals



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Fig. Maintenance Intervals

Introduction



Proper maintenance and tune-up is the key to long and trouble-free vehicle life, and the work can yield its own rewards. The vehicle's Powertrain Control Module (PCM), a computer that controls most driveline related functions, controls many of the functions that at one time, were considered part of a standard tune-up. Mixture adjustment and engine ignition timing are now all controlled by the PCM. No adjustment is possible on these systems. Engine valves no longer need periodic lash adjustment since they are hydraulic and no adjustment is required. So underhood tune-up has taken on a new meaning, generally being centered around engine oil and filter changes, spark plug changes and maintaining the cooling system. Owners are encouraged to set aside time to check or replace items which could cause major problems later. Keep a personal log of services performed, how much the parts cost and the exact odometer reading at the time of service work. Keep all receipts for such items as engine oil and filters, so that they may be referred to in case of related problems or to determine operating expenses. These receipts are the only proof you have that the required maintenance was performed. In the event of a warranty problem, these receipts will be valuable.

The literature provided with your vehicle when it was originally delivered includes the factory recommended maintenance schedule, found in the owner's manual. If you no longer have this information, replacement copies can usually be ordered from the dealer. A maintenance schedule is provided later in this section, in case you do not have the factory literature.



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Fig. Underhood Maintenance Component Locations - 3.5L engine



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Fig. Underhood Maintenance Component Locations - 3.8L (VIN K) engine



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Fig. Underhood Maintenance Component Locations - 3.8L (VIN 1) engine

A number of labels will be found underhood with warnings, cautions, fluid specifications for coolant and accessory drive belt routing. A few examples are given here.



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Fig. The larger of the labels shown here is the Vehicle Emission Certification Information (VECI) label which also includes some tune-up specifications



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Fig. Late-model GM products use a special long-life coolant called DEX-COOL® that can NOT be mixed with other brands or types of coolant

 
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