Consolidation in the car-parts space continues to speed along. The automotive aftermarket has become a darling of PE firms ever since the economy tanked in 2008. Since then, car owners have opted to keep their vehicles longer rather than buy new cars, thus increasing the market for parts made by third parties.

Look at Omega Environmental Technologies' acquiring the two businesses that make up Global Temperature Control LLC. GTC agreed to sell Global Parts Distributors and Santech Industries to Omega, a distributor and manufacturer of parts for car air conditioners and radiators, for an undisclosed price. The deal brings the two GTC companies under the ownership of Omega, which is backed by River Associates Investments LLC.

Global Parts is based in Macon, Ga., while Santech (which GTC acquired in June) operates out of Fort Worth, Texas.

River Associates, based in Chattanooga, Tenn., invested in Irving, Texas-based Omega out of its sixth fund, RAI VI, which closed earlier this year with about $222 million in capital commitments.

GTC, a portfolio company of Austin, Texas-based Owner Resource Group, manufactured air conditioners for the automotive aftermarket under both the Global Parts and Santech brands. Under Omega, each brand will continue to operate independently, but maintain synergies in order to facilitate growth.

"We would love to expand internationally," says Global Parts president Davey Montford, citing Omega's exporting capability, which includes customers in more than 85 countries. By contrast, Global Parts and Santech ship products just within the U.S. and Canada. "It made sense," he adds, with hopes of Omega spreading some of its cross-border wealth.

Bankers Patrick Hanraty, David Allebach and Alex Chadwick of Harris Williams & Co.'s Philadelphia office ran the sale process. The transaction closed in December.

More deals are on the horizon. General Parts International Inc. is rumored to be selling two of its businesses, Carquest Auto Parts and World Wide Parts and Accessories Corp. (known as Worldpac). Reported bidders for Carquest include PE firms Kohlberg Kravis Roberts & Co. (NYSE: KKR) and Leonard Green & Partners LP, as well as strategic buyer Advance Auto Parts.

Among the deals that are still pending include the Carlyle Group's (Nasdaq: CG) buying of DuPont Performance Coatings from E.I. du Pont de Nemours and Co. (NYSE: DD) for $5.2 billion, and Halla Climate Control Corp.'s (KOSE: A018880) purchasing the climate control operations of Visteon Corp. (NYSE:VC). Both transactions are scheduled to be completed during the first quarter of 2013.

One deal that closed in December is Robert Bosch GmbH's purchase of Service Solutions business from SPX Corp. (NYSE: SPW) for $1.2 billion in cash. The deal represents a multiple of 12.7 times Ebitda.

Not only are buyers in the sector pursuing these sought-after companies, they are also paying more. According to a recent BB&T Capital Markets report, Ebitda multiples for auto-aftermarket companies increased from 7.8 times in January to 8.5 times, as of Nov. 27.

For more of our on-going coverage of the sector, visit themiddlemarket.com for "Winners of the Auto Aftermarket," and "Ford Auto Parts at Heart of Baird-backed Eckler's Deal."