Tag Archives: Cool

What to do about heat?

When you look under the hood of the FFE you notice that it has a rather large radiator (most likely its the same part in the ICE Focus–they look very similar). A large radiator like that is designed to dissipate a lot of heat something which the FFE doesn’t generate much of whilst driving around. The whole arrangement shows an interesting design decision on the part of Ford…

When you look at the front of the FFE you see the fake grill and a small opening for air below it, permitting a lot less airflow while driving than the conventionally powered Focus. In this pic you can clearly see the difference:
Red Focus Blue Focus
The front of the ICE Focus is open whereas the FFE just has that gap at the bottom. The reason for this is obvious on the ICE Focus: The gas engine generates a lot of waste heat that must be removed to prevent an overheat situation–even in cold weather there is still plenty of waste heat to go around.

For the FFE on the other hand: Very little heat is generated while driving and thus the front can be a solid nose (with a little decoration); even rounded a bit in an attempt to improve aerodynamics (look at most EVs they all will have very little pass-through). What about that large radiator though? This comes into play during charging and on hot days. The FFE has a battery temperature management system. When charging the battery generates a lot of heat. Heat that also must be dissipated to prevent damage to the battery. This is the reason for the large radiator: To help with this heat removal. In addition, when charging, the car is stationary so there is no forced air coming in from the front; airflow must be generated by the radiator fan (most likely also the same part number as on the ICE Focus). Indeed, during charging I quite frequently hear the radiator fan running at full speed (especially near the end of the charge cycle).

The other use for the radiator is similar: removing heat but this is during a hot day. When the outside temperature gets a bit hot out the car will “complain” that its hot out and should be plugged in. This is to use the fan, and if needed the chiller, to remove heat from the battery if it gets too warm (something it won’t do if parked and not plugged in).

Note that the car also complains when parked and its cold out to be plugged in so that it can keep the battery warm.

I bet you were expecting different subject matter when reading the title of the post?