Ford OHV Cooling Fan Problem

[greenskin]

Hi guys,

I have a 1993 Ford Escort with the 1.3 HCS engine. The problem I am having is that the radiator cooling fan is not cutting in. The temperature gauge reads quite high, but stops short of going into the red. The things I have checked/replaced are as follows:
1) The 30A fuse under the steering wheel.
2) The Thermostat.
3) Thermostatic fan switch (replaced twice).
4) The ignition relay ( which looked like it could have something to do with the cooling fan circuit on the diagram).

I have bridged the fan switch connector and the fan motor works.

If anyone can offer any help it is most welcome.

[Zad]

It sounds like the fan switch isn't sensing properly then. I don't remember whereabouts in the cooling circuit the sensor is. Is it after the thermostat? It could be that the thermostat is sticking closed or operating at too high a point and not allowing coolant past the sensor.

[greenskin]

The thermostatic switch is ontop of the thermostat. Coolant is circulating the system as far as I no because the resevoir heats up (I could be wrong) Could it be possible that the new thermostat is duff?

[Zad]

Unlikely but still possible! I'd solder a couple of wires to the connector pins and measure the resistance in a pan of water brought to the boil.