There should be a grey plug which plugs into the top. You can't see it in your pic its hidden behind a pipe. But on the top of the stem of the air regulator is where it connects to.
Sounds like they're both shut, but because you have adjusted your idle to be correct at cold idle, it will be too fast when hot. If it was adjusted to the correct speed when hot, then you would suffer low idle when cold like Robs.
However if it was working, then when its cold the air regulator is open to increase the rpm by up to 700rpm from experience.
I've only had one that worked really well. It seems they seize after a while. The way they work is fairly simple. There is a bimetallic strip which should open it up when cold. When the engine is started there is a current passed into the bimetallic strip, so when the strip is heating up it shuts the valve.
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