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Trick question? It is 22 mm. across the flats so use a 22 mm deep socket or ring spanner. Threads are 12 mm dia. Go easy doing it up.

I even checked it using a 22 mm. socket so no doubt.
 

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Discussion Starter #3 (Edited)

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So you are talking about the fan switch on the radiator, NOT the "Temperature Sensor" on the thermostat...?

That does look like a 29mm spanner or deep socket is required and they do exist.
They may not be in the usual sets of spanners/sockets, but they are available individually.
 
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Discussion Starter #7
So you are talking about the fan switch on the radiator, NOT the "Temperature Sensor" on the thermostat...?

That does look like a 29mm spanner or deep socket is required and they do exist.
They may not be in the usual sets of spanners/sockets, but they are available individually.
indeed, i was wrong. i dont know what half of the stuff in this car is honestly.
im sure they do but we dont have them here. checked online on 4 near by stores. only 27.28.30. so i went with the 30. and it worked.
 
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