Word of caution. You may not be able to get every drop of coolant out of the block and heater. When I change to "Ford Brand Gold Coolant". I had to flush with distilled water several times to get the old out, then add a 50/50 mix of distilled water and Gold. I found that the complete removal of the bottom hose was quicker than the bolt. Good time to check all of your hoses for wear.
