Simulating a cold engine

[bluewater]

For my 85 380SL, I have a hard time to start the engine when it is warm. But it starts fine when cold. I have read about the causes for this symptom. Without doing the real fix, I am thinking about tricking the system by grounding the temperature switch briefly when starting a warm engine. Is this going to work? Will it cause other problems?

Can someone confirm if the switch (yellow arrow pointed) in the center of the attached picture is the temperature switch? It is on the side of the thermostat housing.

Thanks in advance.