1524 1994-2004 Land Rover Defender 90 Discovery water pumpIf you own a Land Rover with a 3. 9L, 4. 0L, 4. 2L or 4. 6L engine then you have probably have heard all of the reasons they overheat. Some blame the steel liners shifting within the aluminum block. Some blame combustion gases in the the coolant and or the crankcase system. Others point to micro cracks in the block, porosity in the block and a myriad of other reasons. One customer called us to say that he noticed the temperature rising at a low idle