What does a monovalve in an 1988 Mercedes-Benz 560sl?

In a 1988 Mercedes-Benz 560SL, the monovalve is a component of the heating and air conditioning system that regulates the flow of coolant into the heater core. It acts as a valve that opens and closes to control the temperature inside the cabin. When the monovalve malfunctions, it can lead to issues such as inconsistent cabin temperature or coolant leaks. Proper functioning of the monovalve is essential for maintaining a comfortable driving experience.