We replaced ours on a Deville and took 2 hours. You need to let it cool and drain the antifreeze, remove the upper motor mounts, etc. and everything that holds it in. Be careful about the alternator, it's close (check the alternator while you have the radiator out). Make sure that overheating is not the headgasket (I replaced the radiator just ot find th old one was OK. AND don't forget to add the pellets (any GM dealer has them).
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