Out of the blue, there’s suddenly green, red, or other color fluids under my car. WHAT’ S GOING ON!! No need to panic…yet. Depending on the manufacturer, some coolants are red, some are green, and some are yellow. Never mix colors, and always use the color your vehicle already has in the radiator. Also, many transmission fluids are red. If any of these are under your car, you have a leak, and it needs to be addressed. If it’s monstrously large, don’t drive the car, have it towed to us to avoid more damage.