![]() Of these two, the thermostat fails more often than the water pump. If your radiator overflow is full (and your radiator fan is kicking on), it is very likely that a bad thermostat or bad water pump is causing your Expedition to overheat. One of the most common reasons that a vehicle overheats is a bad thermostat. When the cooling system itself is bad, usually the opposite will happen. If you have a temperature gauge, you’ll notice that the temp will usually cool down when you get onto the highway and get moving into clean air. If your engine is overheating in traffic, and the coolant is full, it’s likely a bad radiator fan or a faulty water pump causing your Expedition to run hot. It’s when you are hardly moving that the radiator fan is going to do the work of keeping air flowing into the radiator. While going down the road, the movement of air through your Expedition’s radiator will usually be enough to cool the engine without the help of the fan. Do you have a lot of white smoke? That’s a very good indication that you have a blown head gasket. If you aren’t finding anything even with the dye, look at the rear exhaust. If you are losing fluid but can’t readily see the leak, UV dye is a great tool to locate it. In fact, you really should not need to take it off at all unless the coolant is leaking from the cap itself.Ī slow leak can be more difficult to find than a quick leak since the coolant can evaporate before it has a chance to show itself. Make sure that you don’t take the radiator cap off when the engine is warm. If that’s the case, you can fill it and replace the cap. Your Expedition’s radiator could be leaking from the front or back. Here are some of the reasons that your coolant may run low: Low coolant is a symptom of a cooling system leak of some kind. Low coolant is the most common reason that your Expedition will overheat. If it is full, you can rule out low coolant or a coolant leak, and skip the next section. The first thing that you need to do is check your Expedition’s overflow container. Shutting down before it overheats or as soon as you see it is overheating will usually prevent significant engine damage. Bad head gasket symptoms include white smoke coming from the tailpipe, rough idle, and oil in the coolant. If your Expedition is run for too long of a period while overheating, the head gasket may blow. It does this to relieve the pressure on the cooling system before lasting damage can occur. If your Expedition’s engine gets hot enough, the coolant will begin to boil over and manifest itself as steam coming up from under the hood. Driving while overheating can cause long term engine damage. If this light does come on, make sure that you get off the road quickly and safely. The most common symptom of overheating is the temperature light coming on. Your Expedition will be equipped with a temperature warning light and/or a temperature gauge. Here are the most common symptoms that your Ford Expedition is overheating. If any part of this system fails, your Expedition will eventually overheat.
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