Ford Fiesta Finesse, Heat Gauge is not working

[mzm4u]

Hi
I have a ford fiesta 98 on S plate. Heat gauge is not working at all. it does not go up at all. The car does not heat up.
After some research i thought that it is the heat switch which might be faulty. Firstly i could not found the heat switch. but i did find two switch i tried earthing them (with ignition on) to see if gauge moves but it does not moves. I am not sure if these are heat gauge switch or not. But those were the only switch i found in the car.

Now after 2 hours i gave up and know nothing. So please help me out as it is dangerous to drive the car in this condition.

 

[^neo^]

There should be a little brass sender on the cylinder head, either near the thermostat housing or on the right hand side of the head. Will have a single wire going to it, thats the one that does the guage

 

[mzm4u]

I went back tried again and now the situation is that i found a red housing switch when i earth it the needle goes to the top. so i beleive the switch is okay. Now please guide me for next step . As i have no idea what could be faulty if its a part how much will it be.

Thanks in advance

 

[^neo^]

earthing the switch should have no effect whatsoever. If you earth the wire that attaches to it and the temp gauge goes up, the the sender is duff. Around a tenner from ford and simple to change