DETROIT » A year and a half ago, Chrysler almost went under. Now a new version of the Jeep Grand Cherokee is helping turn its fortunes around by narrowing its third-quarter loss and raising its confidence as it rolls out an unprecedented 10 new models before the end of this year.

Chrysler was weighed down by debt, billions in losses and a poor reputation for quality when it filed for government-funded bankruptcy in April 2009. The company almost didn’t get government help to see it through bankruptcy court. But it emerged from Chapter 11 with a tough new management and an aggressive plan to remake its cars and trucks.

Even though the company is still losing money and must improve its quality ratings, the push for good vehicles is paying off.

Chrysler said yesterday it cut its losses in half between the second and third quarters, to $84 million. The automaker raised its 2010 profit forecast, saying it will end the year with more than triple the operating profit it previously forecast.

The new Jeep drove Chrysler’s results in the July-through-September quarter. The 2011 Grand Cherokee debuted in June to strong reviews, and buyers responded to the upgraded interior as well as advancements like a hydraulic system that lifts up the vehicle if the driver wants to go off-roading. Sales more than doubled between the second and third quarters, to nearly 23,000 vehicles. Profits rose, too. Buyers are paying around $600 more for the 2011 model than a 2010 one, according to auto pricing site TrueCar.com.

The Grand Cherokee has been so successful that Chrysler, which has been managed by Fiat SpA since it exited bankruptcy 17 months ago, is now considering using the vehicle’s base for new SUVs in Fiat’s other brands.

But while the Grand Cherokee’s sales are solid, they’re not surprising, since Jeep buyers have long been some of the most loyal in the industry. To keep its turnaround on track, Chrysler needs the same performance from the 10 new and revamped vehicles coming to market by the end of this year, including revamped versions of the Chrysler Sebring sedan, Dodge Durango SUV and the Fiat 500 minicar, which is new to the U.S. market. The old Sebring, panned for its cheap materials and bland styling, was such a poor seller that the new version has been renamed the Chrysler 200.

Chrysler CEO Sergio Marchionne said much is resting on the launch of the new products, including the timing of Chrysler’s first public stock offering since it went private in 2007. The offering is likely to come in the second half of 2011, after Chrysler sees the results of its product onslaught.

Auburn Hills, Mich.-based Chrysler’s third-quarter revenues rose 5.2 percent to $11 billion. The company compared results with the second quarter rather than the prior year because this was the first time since 2006 it has reported third-quarter results.

Chrysler gained U.S. market share for the fifth consecutive quarter. Chrysler now holds 9.6 percent of the U.S. market. That figure is up from a 7 percent share it held last summer after it exited bankruptcy but down from nearly 13 percent three years ago.

Chrysler expects to make a pretax profit of $700 million this year, up from a previous forecast of $200 million. It also expects to end the year with $500 million in positive cash flow.

Previously, it expected to burn through $1 billion in cash.