Can you mix orange and pink coolant. I have a 13' chevy malibu that calls for orange dexcool but it currently has pink coolant in it. I need to top off the coolant and I have only owned the car for 20,000 miles. What should I do?

you can mix modern OAT coolants,, but not IAT green coolant and modern OAT coolants, so check if both yours are OAT, mixing is allowed