My daughter has a Ka with the same engine as yours....I look after it for her,
The thermotst is in a long plastic housing as you can prob see...hers was leaking...when I took it off I found that the plastic that its made of had more or less rotted away and the big sealing O ring had come out letting it leak...seems its a common prob,
Got a new one on ebay for an amazingliy cheap price...been on a few years now with no probs...I thing I just had to remove the airfilter to gain access to the housing,
She has also had probs with the heater control valve a you have.
Nick.
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