2000 GMC Sierra 1500 Pickup Owner's Manual - Page 322

yellowblue 2. If your vehicle does not have a panel under the center of the instrument panel, or when the panel is removed, reach under the instrument panel towards the front of the vehicle and pull downward on the filter retaining bracket. Automatic Transmission Fluid When to Check and Change A good time to check your automatic transmission 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: 3. Remove the air filter by pulling downward on the element. Remove the second portion of the air filter by sliding it towards the rear of the vehicle and then pulling downward. 4. Install the new filter by reversing the steps listed previously. Be sure to follow any instructions that may be included in the replacement filter package. Refer to the Maintenance Schedule to determine when to replace the passenger compartment air filter. See "Scheduled Maintenance" in the Index. D In heavy city traffic where the outside temperature regularly reaches 90_F (32_C) or higher. D In hilly or mountainous terrain. D When doing frequent trailer towing. D Uses such as found in taxi, police or delivery service. If you do not use your vehicle under any of these conditions, change the fluid and filter every 100,000 miles (166 000 km). See "Scheduled Maintenance Services" in the Index. 6-19