The GMC Sierra truck includes both the 1500 and larger 2500 full-size truck models, and while the GMC pickup truck has been around since the 1960s, the modern-day Sierra includes mainly cars from the 1990s and 2000s, which have similar maintenance requirements. If you find yourself needing to add fluid to a Sierra vehicle from 2004 or newer, however, be aware that you likely have a leak in the system.
Check your power steering fluid when you check the other fluid levels in your car, like brake fluid, transmission fluid and coolant, which should be at least every 30,000 miles in a Sierra 1500 or every 50,000 miles in a Sierra 2500.
Check your power steering fluid level sooner if you notice fluid leaking from under the hood, or if you start to have trouble with the steering system or hear noise coming from the steering system, which may be a result of low fluid levels. If you have to add fluid before 50,000 miles, inspect closely for leaks.
Park your Sierra truck on a level surface and wait for the engine to cool before checking fluid levels. Be aware that an inclined surface or hot fluids can change the fluid level reading.
Locate the power steering fluid reservoir next to the engine, where it should be prominently labeled. Read the fluid level using the markings on the side of the reservoir, and remove cap and add fluid if necessary. Take care not to fill above the maximum fluid level mark.
Inspect all hoses and connectors when checking fluid levels to catch any worn out parts before a leak begins. Also inspect the entire system anytime you have to add fluid to make sure there is not a leak.
