2002 Toyota Corolla power steering

I place a switch on the fuel line because of security reason. On Thursday, I disarmed the switch but the vehicle could not start. An auto electrician look at the kill switch observed that a relay was place on the fuel lines. He disconnected the lines and re attached the other wires straight. However, the vehicle could not start still. He ran some test and realized that the relay which has 02020/1930 was bad; hence same was change and the vehicle started and ran perfectly. On Friday, the vehicle overheated, I checked the radiator there was no water inside same; hence, I fill same with coolant. The vehicle ran ok without trouble. On Saturday, I started the car and realized that the steering was tough and the powering steering light was on the dashboard. I drove the vehicle and the steering had no power and it felt as if I was literally turning the two wheels to make a lock. On Sunday the vehicle overheated again and the fan was not working. The check engine light came on and I parked the vehicle. However, on Saturday the mechanic disconnected the battery and place the faulty relay and the power steering light came off and the vehicle steering was okay on later that Saturday evening when it became tough again