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Old 04-01-2021, 11:54 AM   #5
VB242
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Join Date: Sep 2011
Location: The Right Coast
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Originally Posted by 142 guy View Post
Yes to preventing the formation of ice in the PVC system; but, more likely to prevent the formation of ice which blocks the PVC air flow through the engine (located between the airbox and turbo it would be abnormal for air to be flowing out of the PVC tube and into the turbo). Late '70s VW Rabbits (remember them?) which first got K jet had a problem where the PVC would ice up on the air box side causing a negative pressure in the crankcase and slow evacuation of oil into the intake manifold which could be fatal for the engine. The solution was a heater on the hose to prevent icing. Really only a problem in climates where the temperature drops significantly below freezing and there is a lot of short hop driving.
I don't know about PVC systems but in PCV system excess crankcase pressure gets vented to the airbox to turbo pipe, that dirty air goes through the turbo.
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Originally Posted by 240240 View Post
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