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I blocked only the upper grill on the Golf with pipe insulation and I leave it on year round. In winter I have a coroplast upper grill cover to protect from rock chips. I remove it in spring as it does seem to make the car run warmer than I would like while climbing mountain passes. FWIW, I am running a Stant Superstat which also runs warmer than the original stock thermostat.
P.S. On the Mk IV the engine air intake is in the top driver side opening. Don’t block that one.
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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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