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Understood. Then you could do by adding 2 solenoids (one to block off the line coming out of the thermal valve), and a second T'd in after that, closer to the fan. Or, use a 3 way valve would be even easier. Either should work yet retain the original function of the bleed hole on the thermal...

You need to apply air pressure to the fan clutch to get it to engage. Modern over-the-road trucks use this same system, but opposite, as they apply air to stop the fan (more fail-safe). You need to add a 24VDC air solenoid valve to do so, and "T" it in after the mechanical valve on the upper...