Chapter 7 Engine cooling system Section 2 Composition and working principle Water pump Cylinder block Starter block Fan heater Radiator Cylinder head Starter block Figure 7.3 Cooling water circular route 机械与电子工程学模二 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Chapter 7 Engine cooling system Section 2 Composition and working principle