ENGINE 1.3 QUADRAJET (75PS) 60 OPERATING TEMERATURE CIRCUIT When the coolant temperature goes above 88 +/- 20 C, the thermostat starts opening and the coolant is directed towards the radiator. The radiator causes the coolant temperature to drop significantly. This cooled coolant is then again is directed towards pump for recirculation. EGR AND HVAC RADIATOR CIRCUIT A part of the coolant coming out from the cylinder block is directed towards the EGR heat exchanger , where it absorbs the heat from the exhaust gases before it mixes with the fresh air. This hot coolant is then circulated to the HVAC radiator where it transfers the heat to the heating coil. Now the cooled coolant is directed towards pump for recirculation. 3A.1.2.4. ENGINE COOLING 1. Water pump 6. Supply reservoir 2. Engine coolant temperature sensor 7. Engine oil heat exchanger 3. Thermostat 8. HVAC heater pipes 4. Radiator 9. E.G.R. exhaust gas heat exchanger 5. Fan 10. Water recirculation pipe A. SYSTEM DESCRIPTION In 1.3 QUADRAJET75ps engine the Engine Cooling System also includes HVAC heater coil radiator and EGR heat exchanger in addition to other conventional components. COLD AND WARM UP CONDITION CIRCUIT During the engine cold st art and during the subsequent warm up process (i.e. when the coolant temperature is below 88 +/- 20 C), the coolant from the cylinder block is directed towards theThermostat and since the thermostat is closed, the coolant at kes the by-pass circuit and is directed towards the pump from where it will be re circulated till the cut-of f temperature is reached.
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