Hello I would like to install 2 fans to cool the cooling water. The first should turn on from 50 degrees temperature and the second should turn on from 85 degrees or by switch. Very nice it would be if both could run backwards, if the motor is switched off until the water reaches xx degrees or the battery has 12 volts. Can this be so and if so how or there is something better. Maybe an electronician here who has made such a circuit before ?? Am open for each proposal