Join Date: Feb 2010
Location: Narragansett Bay
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Re: Engine Ventilation Fan always on
The exhaust fan in a Diesel engine compartment serves two purposes. First, they provide for continuous fresh air flow, so any exhaust leak is more likely to be evacuated than enter the salon. This evacuates general odors better too. Neither are absolute. They also provide a better supply of cooler air than the 100+ degree compartment air it would otherwise be inhaling. Cooler air is more efficient combustion and cooler engine compartment temps are better for longevity. Some motors, like ours, actually have intercoolers specifically designed to cool the intake air.
The exhaust fan should always be running, when the engine is running. Not really following the OP. I canít believe it runs 24/7, so fix that, if itís the case. If the engine is running, itís hard to imagine the fan is whatís causing all the noise.
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