Can you mix orange and yellow coolant?

Yellow coolants are also known as "Global" coolants. They are long-life coolant formulas designed to safely mix with ANY (and I do mean ANY, to all you nutcase Euro car owners out there) colour of antifreeze. They are good for all makes and models of cars and light trucks. This means that yes, they can be mixed with GM Dex-Cool (red/orange) and Chrysler/Ford/Mazda GO-5 (orange) with no danger whatsoever. They can be mixed with Toyota Blue, Volkswagen/Audi/Porsche Pink and Purple coolants as well. If you have a car or light truck, it can take Yellow coolant with no problems. If you have a heavy-duty Diesel truck, it can take Yellow to top up, but heavy-duty red Diesel Antifreeze should be used primarily.