Quote:
Originally Posted by bobdbilder
You might be mistaken. What regulates the engine temperature is the thermostat. This closes during engine startup. Typically the coolant temp sensor situates close to it. It opens mechanically when a preset temperature is reached. The radiator and fan reduces coolant temperature.
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The t-stat is what allows engine coolant into the radiator, but once it is there the fan can be used (if there is not enough airflow) to cool it, of course no cooler than the t-stat's closing temp. In my case the coolant temp stabilizes at 78C, so this is the t-stat's opening temperature. I've seen the ECU's documentation, which is where I got the limiting temps from. These were confirmed on the road (ie when A/C is active the fan kicks in when coolant temp goes above 82C, without A/C this is 98C). I like to run my coolant temp around 90C, as the engine has slightly lower FC.
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e·co·mod·ding: the art of turning vehicles into what they should be
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