2004 Cadillac CTS Owner's Manual - Page 403

(f) Lubricate all key lock cylinders. Lubricate all body door hinges. Lubricate all hinges and latches, including those for the hood, rear compartment, console door and any folding seat hardware. More frequent lubrication may be required when exposed to a corrosive environment. Applying silicone grease on weatherstrips with a clean cloth will make them last longer, seal better and not stick or squeak. (g) If you drive regularly under dusty conditions, the filter may require replacement more often. (h) Change automatic transmission fluid and filter 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. − In hilly or mountainous terrain. − When doing frequent trailer towing. − Uses such as high performance operation. (i) Drain, flush and refill cooling system. See Engine Coolant on page 5-27 for what to use. Inspect hoses. Clean radiator, condenser, pressure cap and filler neck. Pressure test the cooling system and pressure cap. (j) Replace the belt (or every 96 months, whichever occurs first). Failure to follow the maintenance described may result in a broken timing belt and could cause severe engine damage. It is important to use only genuine GM parts when replacing the timing belt. (k) A fluid loss in any vehicle system could indicate a problem. Have the system inspected and repaired and the fluid level checked. Add fluid if needed. If you do not use your vehicle under any of these conditions, the fluid and filter do not require changing. 6-9