1994 GMC Jimmy Owner's Manual - Page 261

Add coolant mix at the recovery tank, but careful not to spill be it. Radiator Pressure Cap NOTICE: Your radiator cap is a psi (105 kPa) pressure-type cap and 15 must be tightly installed to prevent coolant loss and possible engine damage from overheating. Be sure the arrows cap on,the line up with the overflow tube on the radiator filler neck. When you replace your radiator pressure cap, an AC@cap is recommended. See "Service Replacement P r and Filter at Recommendations" in the Index. 6-25