1. Disconnect the wire from the terminal «–» battery.
2. Drain the coolant (see «Coolant replacement»).
Helpful hints: It is possible not to drain the coolant completely. It is enough to drain the liquid only from the cylinder block. With a certain skill, the liquid can not be drained at all. It is necessary, having unscrewed the sensor, immediately screw a new one into its place. When replacing the sensor quickly, a small amount of coolant will flow out of the system, which can be easily replenished by adding to the expansion tank.
3. Disconnect the block with the wire from the coolant temperature indicator sensor.
4. Turn out the gauge from a head of the block of cylinders.
5. Establish the gauge of the index of temperature of a cooling liquid in an order, the return to removal.
6. Fill in coolant and check the cooling system for leaks.