To find what you need, you'll have to specify *what* system you're servicing:
* Engine Oil: The oil drain plug is located on the oil pan underneath the engine. The oil fill cap is on top of the engine.
* Coolant: The coolant drain plug is usually located at the bottom of the radiator. The coolant fill cap is typically on the radiator itself.
* Transmission Fluid: The transmission fluid drain plug and fill locations vary depending on the transmission type (automatic or manual). Consult your owner's manual for specifics.
* Power Steering Fluid: The power steering fluid reservoir is usually a separate container with a fill cap in the engine compartment. There isn't typically a drain plug; fluid changes usually involve suctioning out the old fluid.
* Brake Fluid: The brake fluid reservoir is located under the hood and is usually clearly marked. Bleeding brake lines involves opening bleeder valves at each wheel.
* AC Refrigerant: This requires specialized tools and knowledge, best left to a qualified mechanic. There's typically a low-side and high-side fitting on the AC lines, often near the condenser.
Therefore, to answer your question accurately, please clarify what system you're servicing. Your owner's manual is the best resource for precise locations of all service points for your specific vehicle.