The company is also idling four other plants in early 2005, causing 9,000 people to be laid off.
Analyst David Healy of Burnham Securities says GM just built too many cars in the first half of this year.
In Janesville, GM says the closure will affect more than 3,000 hourly workers at the Assembly Plant. It will close in the first week of January, the last two weeks of March and the first week of April.
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