This document defines the methodology for the measurement of heat dissipation and pressure loss of liquid cooled engine EGR coolers in internal combustion engines for road vehicles. The principles of this document are valid for clean and fouled EGR coolers.st edition 2019-10 Road vehicles — Engine EGR cooler — Heat dissipation test methods Véhicules routiers — Refroidisseur de la vanne EGR — Méthodes d'essais de dissipation de chaleur Reference number ISO 21441:2019(E) ？ ISO 2019 ISO 21441:2019(E) COPYRIGHT PROTECTED DOCUMENT ？ ISO 2019 All rights reserved. Unless otherwise specified, or required in the