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I think your Malibu feeds cooling from the bottom like most GM cars, my Century included. I have blocked the upper grill opening wihtout any noticeable temperature increase. Remember, the fans turn on around 228 and off again around 206, so the engine won't overheat as long as the fans can get air flow from somewhere. The blocked grill would be equated to sitting in traffic with no air through the grill induced by forward motion. See my profile pictures for the amount of cooling flow restirction you should be able to get away with. I ran under 215 during my commute both directions today and the air temp was above 50 on the way home. I do see temps run a bit higher when I have traffic lights to contend with....around 220 as long as I don't sit too long.
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