Hi. Perhaps someone has played with those or really knows.
Do these F1 racing engines use a coolant thermostat ? In the liquid path; not louvers at the air flow path.

 

The only reason for a thermostat is to let the engine warm up quickly. Then the "poppet valve" opens when warm and does not shut until after the engine stops and cools back down. There would be no need for one in a racing engine. Think of it as a coolant warm-up choke the same as for a carburetor.