I have a fan noise coming from underneath the drivers seat area underneath the car the noise just does tend to stop after a while as if it’s been controlled by thermostat or something and sometimes smoke is a omitted from the side of the vehicle somebody else suggested it could be a ERV valve.What is this and what is its purpose
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This will be the Webasto auxiliary heater unit . It uses the diesel fuel to heat the coolant more quickly to improve interior heating performance. Fitted to many large Diesel engined cars .
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