Modern engines no longer rely on a single, continuously open coolant circuit. Ball valves and electronically controlled valves regulate flow through the pump and between circuits – closing or restricting flow during cold start to bring the engine to operating temperature faster, then opening fully under load. This precision flow control directly supports emissions compliance and fuel efficiency targets.
It also introduces a new failure mode. Valve mechanisms operating in plastic housings are sensitive to contamination in the coolant. A valve that seizes – most often in the closed position – blocks flow through the pump and triggers rapid, severe overheating, even though the pump itself is functioning correctly.
HEPU® short circuit control valves are manufactured to OE specification, matched to the flow control logic of each application.
Use the HEPU® parts catalogue to find the correct coolant control valve for your application.
