Blocking the upper grille has a better effect on aero than the lower grille, so start with it. Many cars can easily do without their upper grilles.
As for the lower grille, start blocking it from the sides and work your way in. The point where you can keep it blocked year round is what you make permanent, and for the colder months you can temporarily block even more.
You can also make an openable grille block so that you get both shorter warmup and cooling when needed. I did it with power lock motors, so I only need to press a button:
Quote:
Originally Posted by HilseeJ
I have a scangauge. Will the temperature gauge on it be good enough?
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My SG shows the coolant temperature much more accurately than the dashboard's temp gauge.
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is
where you're going, not
how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread