Buick Park Avenue 2003 Owner's Manual

The recommended oil type for a 2003 Buick Park Avenue is 5W-30 conventional or synthetic motor oil.
To reset the 'Check Engine' light, you can disconnect the battery for about 15 minutes, then reconnect it. Alternatively, use an OBD-II scanner to clear the codes.
To replace the cabin air filter, locate the filter housing under the passenger side dashboard, remove the cover, and replace the old filter with a new one.
Start by checking the refrigerant levels and inspecting for leaks. Ensure the compressor is engaging and check the fuses and relays associated with the A/C system.
Common causes of a rough idle include a dirty throttle body, faulty spark plugs, vacuum leaks, or a malfunctioning idle air control valve.
To replace the serpentine belt, locate the belt tensioner, use a wrench to release tension, remove the old belt, then install the new belt according to the belt routing diagram.
Jack up the car and remove the wheel, then unbolt the caliper and remove old brake pads. Compress the caliper piston, install new pads, reattach the caliper, and replace the wheel.
The transmission fluid should be changed every 50,000 to 60,000 miles under normal driving conditions. Check the owner's manual for specific recommendations.
The recommended tire pressure for a 2003 Buick Park Avenue is typically 30-32 PSI for both front and rear tires. Check the placard on the driver's door for exact specifications.
Check the fuse and relay associated with the power windows. If both are fine, test the window switch and motor for faults. Wiring issues may also cause malfunctioning.