Chrysler and three plaintiffs settle lawsuit alleging casting sand causes sludge in the radiators. January 3, 2018 — A Jeep Wrangler heating and air conditioning lawsuit is over, at least for the three named plaintiffs who filed the lawsuit against Fiat Chrysler (FCA US). Plaintiffs Joseph White and William and Donna Mooradian allege 2012-2017 Jeep Wranglers suffer from heating and air conditioning problems because of sludge in the radiators, heater cores and oil cooling systems. According to the Wrangler lawsuit, FCA uses sand casting to manufacture certain engine parts, a method that uses disposable sand molds to form complex metal parts from alloys. The rest of the engine components use die casting, including for the engine blocks, but the automaker used sand casting for the cylinder heads. The plaintiffs say any excess sand will seep into other engine components unless all the sand is completely removed from the cylinder heads.