1996 GMC Savana Van Owner's Manual - Page 248

Thermostat Engine coolant temperature is controlled by a thermostat in the engine cooling system. The thermoskt stops the tlow of coolant through the radiator until the coolant reaches a preset temperature. When you replace your thermostat, an AC@thermostat is recommended. When to Check Power Steering Fluid It is not necessary to regularly check power steering tluid unless you suspect there is a leak in the system or you hear an unusual noise. A fluid loss in this system could indicate a problem. Have the system inspected and repaired. How To Check Power Steering Fluid When the engine compartment is cool, unscrew the cap and wipe the dipstick with a cleanrag. Replace the cap and completely tighten it. Then remove the cap again and look at the fluid level on the dipstick. The level should be at the FULL COLD mark. If necessary, add only enough fluid to bring the level up to the mark. To prevent brake fluid contamination, never check or fill the power steering reservoir with the master cylinder cover off. Power SteeringFluid What to Use Refer to the Maintenance Schedule to determine what kind of fluid to use. See "Recommended Fluids and Lubricants" in the Index. Always use the proper fluid. Failure to use the proper fluid can cause leaks and damage hoses and seals.