20722340 2003-2007 Genuine Volvo/Mack D12 EGR Cooler

Volvo D12 EGR Cooler — What It Does The EGR cooler on the Volvo D12 takes exhaust gas headed back to the intake and pulls its temperature down — a gas-to-coolant heat exchanger that makes recirculation survivable for the engine and effective for emissions. It lives with exhaust heat on one side and coolant on the other, and its failure mode is the two sides meeting. Common Symptoms of a Failing EGR Cooler Coolant loss with no puddle to show for it — it’s leaving through the exhaust White smoke, sweet-smelling, especially at start-up Coolant system pressurizing as combustion gases…