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Just looked through the front grill, and noted fairly large openings. Behind this grill, there are some shutters that I assume open and close depending on what is needed, but have not seen anything about them so far. Does anyone know how they function? Do we need to get a Bolt screen to protect the radiator against damage from small pebbles? Assume the radiator is needed to assist with the TMS for the battery.
 

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No. No need for a screen. Take a look at any ICE powered car, beyond the cosmetic grill on the front that does help flying debris, such as birds, or junk that falls off somebody's pick up from damaging the radiator, there is no screen. Little pebbles just aren't a problem.

Bugs can be a problem. They don't cause any damage to the radiator, but they get stuck in there and can cause the radiator to run hot. Whenever a car goes in for some maintenance or you know you just drove through a massive bug storm, the radiator should be inspected. Cleaning it usually just involves compressed air, a brush and maybe a pick. Bolt will be no different. The radiator should be inspected.
 

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Newer EVs, including the Chevy Volt, Chevy Bolt EV, and the Ford EVs (Fusion and C-Max) all have the electric shutters that close off the air flow through the radiator when driving on electricity at higher speeds, because that air flow causes drag and reduces range. It will open when the A/C and/or the gas engine (except in the Bolt EV) is running and needs cool air to remove heat.

So if you drive on clean roads, you will never need any additional screens to protect the radiators. The shutters will protect the radiators and reduce drag.
 

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What is a Boltscreen and Boltshelf and why do I want one? :confused:
They potential aftermarket accessories patterned after accessories made for a Volt by a Volt owner.

BoltShelf would be a cover for the cargo compartment that lifts when you lift the hatch. The Volt didn't have one of these, so the "VoltShelf" was very popular among Volt owners. The Bolt has a fabric shelf, but there may be enough people who would prefer a hard shelf to make it worth producing.

BoltScreen would be a mesh screen that's installed in the front grille to prevent small rocks or insects from damaging or plugging the radiator.
 

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I've seen people use those mesh gutter guards as a Diy grille screen. NOt specifically on the Bolt but it seems to work on other vehicles and it's pretty cheap.
This stuff:
 
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