Where do you fill the power steering fluid on a 1990 Cheyenne?

The power steering fluid reservoir on a 1990 Chevrolet Cheyenne is typically located under the hood, near the firewall, and often has a cap marked "Power Steering Fluid" or with a power steering pump symbol. It's usually a plastic reservoir and may be somewhat translucent so you can see the fluid level.

However, the exact location can vary slightly depending on the engine and options. The best way to be certain is to consult your 1990 Cheyenne's owner's manual. It will have a diagram showing the location of all fluid reservoirs. If you don't have the manual, you can often find a PDF version online by searching for "[Year] [Make] [Model] owner's manual."

Failing that, a quick visual inspection under the hood should reveal a reservoir that looks like the description above. Be careful not to mistake it for other fluids.