Ford Ka Radiator Fan

[JuanBoy]

Can some one help I have a ford ka 1.3 1996 fan will not kick in if you take plug off sensor fan works it goes to default runs on full speed I have changed sensor still the same the water pump is ok there is a return there is a relay in engian bay when fan is running on default and you disconnect it fan cuts out so think relay must be working?? Temp light on dash comes on when first start but will not come on again even if car bubbles over help please

[ADEuk]

Are you sure the water pump is circulating the water?
Does the engine bubble over if left idling with fan running?

[JuanBoy]

You can see a flow of water returning in the expansion chamber just ran car for hour with fan running it was fine pipes only warm to touch when I reconnect sensor fan will cut out as it should until it reaches temp but fan dose not kick in and light on dash will not come on to worn you

[Locknut]

I'm inclined to agree with ADEuk and suspect the water pump. I'm not too familiar with the Fiesta but I don't think you should see water flowing through the expansion bottle. The hoses should be hot to the touch with the car warmed up. Does the radiator become very hot to the touch when warmed up? It should.

[JuanBoy]

Ye if I run it without fan running ie put wire back on temp switch it gets so hot I almost burst a pip the pips got so hot if you undo cap on expansion chamber with car running there is a pipe on bottom and one coming in on the top the top one has a flow of water so I believed it to be flowing ie pump is working is this wrong I'm not sure just guessing

[Krikkit]

Surely it's just a duff sensor? Not unknown for them to fail.