Yes you can manually operate the fan with a switch, but if you leave it on all the time, you will waste enough in gas to pay for a new relay.
If you forget to turn it on when stopped in hot weather, you will blow a head gasket.
A new relay is only $15, so why not just go to Autozone and buy it?
But also check the radiator temp sensor first, by seeing if the fan comes on when you shunt the sensor?
If so, then it is the sensor, not the relay.
thanks but it is not the relay according to fords it is a problem with the module
Ford likes to call relays, "modules".
First try shunting the radiator temp sensor.
If that makes it go on, the sensor is all that needs replacing.
i changed the sensor at the back of the engine i dont know where the radiator temp sensor is also the fuse box says the relay is in f12 but there is no relay in there any idea where it may be ta. fords put the car on their dignostics coputer and said it was a problem with the module and would cost about £1000 to repair
Usually the fan is controlled by a temp sensor in the radiator, but there is no reason why the coolant temp sensor in the head could not be used by both the fan and the fuel injection.
I see they are under $5.
http://www.discountbodyparts.com/catalog...
But I read that the Focus fan temp sensor was in the thermostat housing, but that was an earlier year.
I see that the Focus uses a relay and a control module as well and it is not as simple as I though/hoped.
It should be, but they do like making cars more complex all the time for some reason.
I suppose they did that because the AC is supposed to also make the fan go on.
You could try turning the AC on and seeing if it works then.
I tried to look up more details, and I did not find good information, but horror stories instead, like this one:
http://honestjohn.co.uk/forum/post/index...
I would be tempted to put my own sensor and relay in to control the fan.
Putting it under the control of the ECU seems just crazy to me.
It should be so simple.
thanks for your help but it seems my only way out is to bypass the ecu and run the fan manually of a switch will this be ok or will i do more damage to the ecu thanks
Using your own fan switch will be fine.
I would consider leaving it on all the time in summer, just so you do not forget.
On the highway and in winter you probably won't need it at all.
They sell auxillary electric fans for cars that did not originally have one.
Such as for a towing package or something.
And they come with a simple kit to add a temperature sensor and relay.
I have a 1984 Maserati, and its fan temperature sensor is just strapped to the outside of the radiator hose.
Talk to a parts place like Autozone, and see what they can think of.
People add their own electric fans all the time, so it should not be hard to buy just the controls to use on the fan your already have installed.
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WARNING: WHEN WORKING IN THE ENGINE COMPARTMENT, STAY CLEAR OF THE FAN BLADE. BECAUSE IT IS ELECTRIC AND TEMPERATURE SENSITIVE, IT CAN START AT ANY TIME IF THE IGNITION IS ON. 
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thanks for your help but putting in a snsor and arelay is beyond me.but will it be possible for me to wire the fan direct to a on off switch and just turn it on in traffic jams.this i can manage if it is ok to do thanks
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