Toyota Repair: Engine coolant, red, green

Question
I own a 2001 Toyota Corolla LE.  Is there any harm to this vehicle by having green coolant instead of the red that came with the vehicle?  AND WHAT IS THE DIFFERENCE between green and red.

Answer
Depends
Some red and green coolants are compatible; the manufacturer will usually note it on their containers.  The owners manual will tell you what you have in your radiator, when to change it, and sometimes even compatability.

Hope this helps.

Vince