https://read.abdul.solutions/blog/nissan-sunny-b14-qg15-overheating-clogged-radiator/ https://read.abdul.solutions/images/uploads/nissan-sunny-b14-radiator-clogged-mud.webp The Nissan Sunny's radiator lying on wet tiles after pressure washing, surrounded by a wide spread of brown mud washed out of its fins. What came out of the fins of a radiator that looked completely normal in the car. https://read.abdul.solutions/images/uploads/nissan-sunny-b14-qg15-water-pump-impeller.jpeg The water pump removed from the QG15 engine, its impeller vanes intact and still firmly fixed to the pulley shaft, held over the engine bay. The part we'd been sure about. https://read.abdul.solutions/images/uploads/nissan-sunny-b14-qg15-thermostat-test.jpeg The thermostat taken out of the Nissan Sunny sitting in a pan of hot water during a bench test, its valve open and bubbles clinging to the spring. Bench testing the thermostat we'd pulled the night before. It opened on cue.