Failure of auxiliary small water pump of Mercedes-Benz gl500 heater

The failure symptoms of auxiliary small water pump of Mercedes-Benz gl500 heater are as follows.

1, the idle speed is unstable, and the pump failure will increase the rotation resistance of the pump.

2. The engine will make noise. This sound is a rotating friction sound. This sound can be accelerated with the rotation of the engine, and the volume changes.

3. The cooling system fails, and the engine temperature is too high due to the decrease of cooling water.