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One the left, forward, upper cooling tin is an opening that allows air from the oil cooler to be expelled. This output is directly above the #3 exhaust port and when the engine is idling you can crawl underneath and feel the hot air blowing down in front of the engine (go ahead, crawl underneath and feel for air under both sides). I know VW had a reason but, darn it, they didn't tell us why! What do you suppose would happen if this duct was sealed, thus forcing the air to flow around the cylinders and get expelled with the rest of the cooling air? The air pressure would increase, correct? But with this heated air (when the engine does become hot enough to use the oil cooler) going past the cylinders would it just heat them up or provide no extra cooling at all (my guess would be "yes")? Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L, Berg five-speed '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/