I started with clear packing tape to test the concept, but dirt begins to stick to it and look bad. For now, I'm using black duct tape to block the upper grill, and need to build another coroplast lower block.
Do you run a gauge to monitor coolant temp? A full block on my TSX runs the temp up to 215F and then the cooling fan kicks on. The stock temp needle on the car doesn't fluctuate enough between the normal operating temp of 190F and the fan engagement at 215F to know that the fan is coming on.
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