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Arragonis, I have an 04 Golf TDI and it sound like a similar layout to yours. I have used an upper grill block year round with no overheating issues, even climbing mountain passes. Everything I have read says letting a diesel breathe easier helps power and mileage. I did not block the engine air intake at all. My grill has horizontal slats and the one that feeds the intake air is wide open. I use pipe insulation over the lower grill slats in winter to block off some of them. I block some of the intercooler for faster warmups in winter but usually pull those out before long climbs. The Scanguage shows the intake air temperatures really ramp up when the engine is pulling hard under boost.
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60 mpg hwy highest, 50+mpg lifetime
TDi=fast frugal fun 
https://ecomodder.com/forum/showthre...tml#post621801
Quote:
Originally Posted by freebeard
The power needed to push an object through a fluid increases as the cube of the velocity. Mechanical friction increases as the square, so increasing speed requires progressively more power.
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