1998 GMC Safari Owner's Manual - Page 291

Power Steering Fluid I When you replace your radiator pressure cap,GM cap a is recommended. Thermostat Engine coolant temperature controlled by a thermostat is in the engine coolant system. The thermostat stops the flow of coolant through the radiator until the coolant reaches a preset temperature. When to Check Power Steering Fluid It is not necessary to regularly check power steering fluid unless you suspect there is a leak the system or in you hear an unusual noise. fluid loss in this system A could indicate a problem. Have the system inspected and repaired. 6-29