it's water cricle loop in engine of audi a3 that increase water coolant to cool down the transmision clutch oil temperature.
i got happen some protect in TCU transmision control module when i went to the mountain.the transmission is not shift gear to 4 speed that just shift gear bewteen 1-3 speed.
is it anyone to happen?

so i design new fan system module of bracket to insert fan on coolant. it's can be cool down more temperature to prevent this protect.
it's can set temperature value 70-100 of controller.

but i want to say the protect that like ECU oil supply interrupt then not into 4th gear.
when the speed to low down the 1th gear that ECU is can oil supply it.
i think it protect TCU temperature is too higher if i guess this right.