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get a scangauge.
remove your cross bars on the roof rack(most tahoes ahve them)
with the scangauge, check your temp. if it is like my friends silverado runs about 200 deg, and never goes above 203ish.
then do a grill block start from the top and work your way down.
if your a/c compressor is going bad either fix it or ditch it....it causes drag.
iflate your tires.
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