I have a confession...I cheated and looked in my Haynes Hawker Hurricane Owners' Workshop Manual. This text is from the Hurricane Mk.II pilot notes (The Hurricane Mk.I pilot notes is very similar in what it says);
Radiator Flap Control – The airflow through the coolant radiator and
oil cooler is controlled by a lever (26) on the left hand side of the
pilot's seat. In order to release the lever for operation the thumbbutton
must be depressed.
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