Duct tape! Wanted to see what results I could get, before I made a Coroplast cover. Since the CR-Z has absolutely no gauges to monitor what is going on underhood, I temporarily moved the ambient sensor into the engine compartment so I could get an idea as to what it is doing. 88 degrees is the highest I've seen so far. There is no other way for air to get in, besides the grille, so the bottom row of the grille is still open.
I'm already happy with how it is performing, and hope to change to Coroplast over Thanksgiving weekend.
