Quote:
Originally Posted by Piwoslaw
My P307 has A/C (the condenser is right in front of the radiator) and only 1 fan. The fan kicks in when the coolant temperature reaches 98C. If A/C is active, then the fan keeps coolant temperature below 82C, which is a bummer if you are trying to keep the engine running hot for FE
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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.
Bear in mind that this singular fan setup also need ventilation of the engine bay. In a different discussion, this was researched by Dr. Karmann and was used to modify airflow around the windshield. A small engine compact car may achieve this by simply removing the weather strip or seal where the windshield meets the hood. Leaving a small strip where fresh air inlet is so that engine heat might not enter the cabin.
Bigger engines with different layouts may require bigger sized outlets. I seem to recall side air vents were in fashion at one time. This time it could actually be useful.