Methods and systems are provided for maintaining a desired engine coolant level and a relative glycol amount in the engine coolant by using water sourced from on-board vehicle systems. In one example, a method may include supplying water to the engine coolant reservoir in response to the engine coolant level decreasing below a threshold. Also, a relative glycol amount in the coolant may be maintained at a threshold amount by adding water to the coolant in response to a relative glycol increasing above the threshold.

Embodiments of the disclosure pertain to a monitored heat exchanger system that includes a heat exchanger unit in operable engagement with a heat generating device. The heat exchanger unit has a frame; and at least one cooler coupled with the frame, the at least one cooler having an airflow side and a service fluid side. The system includes a monitoring module coupled to the heat exchanger unit. The monitoring module an at least one sensor coupled with a panel; and at least one controller housing coupled with the panel. A microcontroller is disposed within the controller housing and in operable communication with the at least one sensor. The at least one sensor has a rotating member configured to generate a system signal proportional to an amount of rotation of the rotating member.

A device for convective cooling of a functional assembly for a motor vehicle includes a fan, which in operation, is designed to move air along a flow axis defined by the design and placement of the fan. A flapper valve device is provided having an air transit opening and a flapper valve assembly disposed therein, with at least one flapper valve provided to change the open-flow cross section of the air transit opening and being adjustable between a closed position and an open position. A control unit is provided. The fan and the flapper valve device are arranged at a distance from each other such that air moved due to operation of the fan then flows through the air transit opening at least when the flapper valve device is in the open position. The control unit is designed to detect at least one operating parameter of the fan.