So what happens when the air-conditioning in your car tests good, but your family is not getting along because everybody is all hot and sweaty and angry in the back of the car? I’m Rick Smith master certified technician. Today we’re working on a 2008 Ford expedition and I thought I’d tell you little bit about what we found and help you understand the systems a bit more. This vehicle has dual air-conditioning so it has an air conditioner in the front and in the rear. In both cases we start with a heater core. A heater core is like a small radiator and basically we run hot radiator fluid through that and it gives us heat. Then we also have an evaporator and the evaporator is basically the same thing, a small radiator but instead of hot engine coolant we have cold refrigerant through it. Then we have a blower that blows cool air on our face and we can direct that air either over the cold part or over the hot part or to our feet or face or a mixture of the temperatures. First of all I want to show you one of the things that we found. If you look way up there that’s where the air comes out to go up to the top of the car to blow onto our faces and if you’ll see there’s a gap in that tubing right there. On this car where we have this cold air that were now basically piping into the panels of the vehicle instead of onto our face. So we don’t have good airflow. Secondly in here is that evaporator we talked about, you can’t see it so I’m going to show you what an evaporator looks like. Now the evaporator sweats and it gets moisture condensation on it just like a cup of ice water sitting on a hot day. This is what can happen with the moisture, it collects all the lint and everything on it because it’s kind of like your dryer in your house you know how you have to clean the lint trap all the time. So about 25% of the evaporator in this car has lint on it and so we can’t transfer the temperature and make a cold. So we have two problems back here, one blowing on our face hard enough because blown into the wrong spot and number two we can’t transfer the temperature enough because we have that lint buildup. Keep in mind this is a very big vehicle and this is the middle of July in Phoenix Arizona search blistering hot so we’re gonna shoot some more videos on the front but this tells you what’s going on the back so stay tuned on our next video until next time safe travels and blessings to you.