News Summary: Agency probes Porsche over coolant Associated Press Copyright 2013 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Updated 3:23 pm, Tuesday, April 30, 2013 U.S. safety regulators are investigating coolant leaks in Porsche 911 sports cars that could cause roadway spills and send vehicles careening out of control. The National Highway Traffic Safety Administration said the probe affects about 10,000 models with the GT1 engine from the 2001 through 2007 model years.