STC3261 - Heater MatrixHeater Matrix for the Range Rover P38 heating system. Located within the heater housing behind the dashboard, the heater matrix is a small radiator core through which engine coolant circulates. The blower motor draws air across the matrix fins and delivers heated air to the cabin via the distribution vents. The companion O ring seal (STC3262) should be renewed at the same time to prevent coolant leaks at the matrix connections.