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Q:

my 207 Lucerne overheats. Replaced thermostat, cooling fans, water pump
on 2007 Buick Lucerne

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
engine still overheats. The A/C stopped working too. Runs OK on the interstate roads but overheats in traffic
(1) Answer
I had the same issue and it was a plastic fin underneath that deflects the air upwards toward the radiator