Hello, The Evaporator coil is actually the evaporator "core" it looks like a mini radiator in front of your regular radiator on the front of your truck. The easiest way to clean them is to go to the car wash and and soak the front of your truck through the holes where air goes in with soap and water and carefully power wash them out. The fins are easily bent so don't get any closer than 10 to 12 inches to the front of your truck. I hope this helps.. If you have any more questions, please ask. If I answered your question to your satisfaction, please click "ACCEPT" so I receive credit for assisting you today.