The thermal switches you mentioned in your post are for the door latches when you use the self clean. They are not connected to the cooling fans.
The cooling fans are powered up by the control board when you start any of the ovens in any cooking mode and should turn off after the control board turned off and the ovens cooled down to 150°F.
Unfortunately no thermostats for the cooling fans are shown anywhere at the diagrams. The only way to find them is to trace the wires from the cooling fans. In order to do it you have to remove the oven from the cabinet.
Here are the breakdown diagrams and Replacement parts for General Electric JTP35SM1SS ELECTRIC OVEN | AppliancePartsPros.com