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I would expect sliding grill covers to to be more prone to icing.
Gill style covers that I bought, not so much. If the grill shutters do ice I would expect if you were to stop and sit for a few minutes heat coming off the radiator would melt the ice rendering the shutters functional once again. At that point I would just lock the shutters in the open position, let the engine run cool.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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