2015 Buick Enclave Owner Manual - Page 270

Vehicle Care 2. Remove the radiator pressure cap when the cooling system, including the upper radiator hose, is no longer hot. Turn the pressure cap slowly counterclockwise about one full turn. If a hiss is heard, wait for that to stop. A hiss means there is still some pressure left in the system. 1. Detach the fasteners and lift off the panel that covers the radiator cap. 3. Keep turning the pressure cap slowly and remove it. 4. Fill the radiator to the base of the filler neck with the proper DEX-COOL coolant mixture. 10-15 5. Fill the coolant recovery tank to the FULL COLD mark or to the FULL COLD ISO symbol mark.