By Vanessa Mock 

BRUSSELS--The European Commission Thursday launched formal legal proceedings against Germany over the continued use of a banned refrigerant in new Mercedes-Benz cars made by auto maker Daimler AG.

The EU executive has also sent a warning to Belgium, Britain and Luxembourg, saying that they could face potential legal action for the local sale of cars that are in breach of the new EU rule on the refrigerants.

The move comes after the EU's long-running probe into the German premium car maker's refusal to comply with its directive that banned the air-conditioning refrigerant known as R134a since the start of 2013. The German government has backed Daimler in the case.

The EU directive is part of its legislative effort to clamp down on emissions of greenhouse gases and their impact on climate.

Daimler has previously argued that it wants to continue using the cheaper R134a fluid for safety reasons.

The EU's industry commissioner, AntonioTajani, said the commission had held both political and technical meetings with German authorities over the past weeks, but that the time had come to find a solution. Under EU rules, countries that flout EU laws can be taken to the EU's top courts in Luxembourg, which can impose fines if the case of guilt.

"My job is to back European rules," Mr. Tajani told reporters in Brussels.

Mr. Tajani added that he confident of finding a solution with Germany. "We have many contacts with Germany on this."

Thursday, Daimler said it has followed proper procedure regarding the refrigerant which it believes it can use in its cars, including new models, until the end of 2016. It also uses the refrigerant in cars sold outside the EU including the U.S.

The German auto maker said it has suggested an alternative to Brussels to address its environmental and competition concerns regarding its continued use of the R134a fluid.

"We submitted a proposal, via the German government, that would compensate for the higher carbon emissions that come about when using the [R134a] cooling fluid," said Daimler spokesman Matthias Brock.

Mr. Tajani acknowledged that Daimler had submitted a technical solution though the auto maker could also recall cars using the old fluid that were sold in the first half of last year, which an EU official says number around 113,000.

A possible recall might also involve cars sold after June last year if the commission confirmed "indications" that Germany had deliberately used out-of-date approvals for selling new cars to get round the new legislation.

In its related case, the commission has sent so-called pilot letters to Britain, Luxembourg and Belgium, seeking clarification on whether they complied with EU rules by also using old vehicle approvals. A pilot letter marks the first step the EU's infringement procedure, and precedes potential legal action by the commission.

The EU has mandated that car makers use Honeywell International Inc.'s R1234yf which it argues is far less harmful to the environment than the R134a fluid. The U.S. company said last month it would spend about $300 million to build a new refrigerant manufacturing plant in response to increasing demand overseas.

Daimler has said that the Honeywell agent is dangerously combustible, a claim Honeywell rejects. The Commission's Tajani said Brussels has found "no problems" with the Honeywell fluid.

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