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i have never heard of such a mod, but make sure the temp. dial is on the 'cold' setting, otherwise it will put hot air in the cab. (just in case you didn't know.)
i always run mine on the 'defroster' setting, and don't notice any hot air coming in from the vents.
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"we are just going to have to build it so that the weakest link is... nothing." haha
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