Jim Grant's Tech Tips
Honda Accord, Cooling Fans Not Working
I am writing because we just replaced a radiator in our '92 Honda Accord
DX. For some reason the cooling fans will not come on. We are worried
that this is the sign of another problem. We made sure when we replaced
it that we bled the air out but no matter how much we drive it the fans
will not come on. Is this a problem? Please help.
cooling fans must be functional or you will damage the engine. If the
cooling fans were working prior to changing the radiator then it's likely
that there is an electrical connection problem or the coolant temperature
sensor for the cooling fans has failed. There's a temperature sensor mounted
in the radiator, usually in area of the lower radiator hose on Honda's,
that controls the cooling fans. With older vehicles it is not uncommon
to have some corrosion buildup at this coolant temperature sensor's terminals.
Disturbing the electrical connectors will sometimes cause them not to
make a good contact when re-connected. Also double check the electrical
connectors for the cooling fans. Usually a little cleaning is all that
is needed to get the cooling fans working again.