Just took the front bumper/grill off my Cobalt to remove the front license plate holder (damn thing was pop riveted on) and do a partial grill block and I was amazed at how much junk got in the radiator in only 15 months.
Granted I drive back country roads at night in NC so I do kill my fair share of bugs.
After blocking the lower grill I think I'm going to put some netting on the top opening.
I have some window screening left over from a project that should probably help keep my radiator from getting as bad as it sounds like yours was.
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Lifetime mpg
2012 mpg
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