Quote:
Originally Posted by workingonit
Did not know that, thanks!
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On petrol engines there is coolant outlet temp sensor on lower coolant hose from radiator to water pump. Its sole purpose is to control the need for electric pusher fan (in addition to AC system pressure). On diesel engines there is no separate coolant outlet sensor and electric pusher fan is activated if engine coolant temp rises too high. Diesels have lower running temp (thermostat 88 C) and hence lower coolant system pressure (1,4 bar expansion cap vs. 2,0 bar on petrol).