GM Daewoo Auto & Technology Co. will idle its Bupyeong plant that produces the Winstorm/Captiva cross/utility vehicle and Tosca midsize sedan, Ward’s learns.

“We will close our No.2 plant in Bupyeong from Dec. 1 through Jan. 4,” a spokesman says. “This will involve 23 working days of production.”

The action is being taken because sales of both vehicles have stagnated.

The spokesman says the stoppage is separate from the auto maker’s previously announced plans to close all production plants from Dec. 22 through Jan. 4 to offset a vehicle surplus caused by lower-than-anticipated sales.

“Manufacturing at our No.2 plant at Bupyeong is the most seriously affected by decreased demand,” the spokesman says.

Domestic sales of the Tosca in October dropped 42.4% to 965 units from year-ago, while exports of the sedan rose slightly from prior-year, GMDAT says.

Domestic deliveries of the Winstorm plunged 69.3% to 755 units in October, from like-2007, while exports of the Winstorm/Captiva fell 35.5% to 7,035.