UPDATE 2-Carlyle, Bain submit preliminary bids for $5.8 bln stake in Hanon Systems -newspaper

(Adds Valeo denial in paragraph 5)

SEOUL, June 22 (Reuters) - Carlyle Group, Bain Capital and auto supplier Mahle have each submitted preliminary bids to buy a 70% stake in South Korea’s Hanon Systems worth an estimated 6.6 trillion won ($5.8 billion), the Korea Economic Daily reported.

The combined stake in Hanon, a maker of automotive air conditioning systems, has been put up for sale by local private equity firm Hahn & Company and Hankook Tire & Technology Co Ltd , the newspaper said, citing unnamed investment banking sources.

Hanon Systems said in a regulatory filing on Wednesday that nothing has been decided.

A spokesperson for Germany’s Mahle declined to comment. Representatives for Carlyle and Bain did not immediately respond to requests for comment.

The newspaper said France’s Valeo had also submitted a preliminary bid but the auto supplier denied that it had.

Hanon Systems, the world’s second-largest supplier of auto thermal management systems, reported revenue of 6.9 trillion won and operating profit of 315.8 billion won last year.

$1 = 1,135.0600 won Reporting by Joyce Lee; Additional reporting by Gilles Guillaume in Paris; editing by Louise Heavens and Edwina Gibbs