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Have you blocked the upper grille too ?
From what I witnessed on the Echo, most of the cooling is done via the lower grille. Since you live in a warm and mountainous region, it is not the ideal thing. As you said, creating an opening on the lower grille block will allow for better cooling.
I had the same problem when I completely blocked the lower grille earlier this Winter. Had to clear at least one of the 3 holes on the lower grille to maintain a constant 186-190F.
You might have to clear a larger area for proper cooling. I believe the upper grille block would be a better alternative in your case.
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