1998 GMC Safari Owner's Manual - Page 290

Adding Coolant If you need more coolant, add the proper DEX-COOL@ coolant mixture at the coolant recovery tank. Ihning the radiator pressure cap when the engine and radiator are hot can allow steam and scaldingjiquidsto blow out and burn you badly. With the coolant recoverytank, you will almost never haveto add coolant at the radiator, Never turn the radiator pressure cap even a little when the engine and radiator are hot. Radiator Pressure Cap -- -- NOTICE: Y n ra&#or cap is B 15 psi (IO5 kPa) or presmm-type cap and must be tightly installed to prevent coolant loss and podble engine damage from overheating. Be sure the arrows on the cap line up with the over&law tube an the radiator mer neck. Add coolant mixtureat the recovery tank, but be careful not to spill it.