A cooling water circuit system for an engine includes a radiator bypass passage through which cooling water of the engine bypasses a radiator, a heat exchanger disposed in the radiator bypass circuit to perform heat exchange between the cooling water and lubricant oil of an automatic transmission, and...http://www.google.com.tw/patents/US7073467?utm_source=gb-gplus-share專利 US7073467 - Cooling water circuit system
