1998 Chevrolet Lumina Owner's Manual - Page 264

IRadiator Pressure Cap Power Steering Fluid NOTICE: Your radiator capis a 15 psi (105 kPa) pressure-type cap and must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck. m e n you replace your radiator pressure cap, AC' an cap is recommended. 3100 (CodeM) Engine 3800 (CodeK) Engine Thermostat When to Check Power Steering Fluid Engine coolant temperature is controlled by a thermostat in the engine coolant system. thermostat stops the The It is not necessary to regularly check power steering flow of coolant through the radiator until the coolant fluid unless you suspect there a leakin the system or is reaches a preset temperature. you hear an unusual noise. fluid loss in this system A could indicate a problem. Have system inspected the When you replace your thermostat, an AC' thermostat and repaired. is recommended. I 6-26