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If it was actually overheating and not a faulty temp sensor.
Without actually seeing your TD5 Defender, its pretty hard to know, but:
*Weak/failing viscous fan.
*Thermostat.
*Faulty expansion tank cap.
*Other items such as failed water pump, as in the drive from the power steering pump has sheared, generally causes more coolant loss out of the expansion tank cap due to a lack of flow.
*if the water pump seal has gone, the coolant loss will be out a small hole in the housing the water pump is mated to on the passenger side. This can be less obvious so coolant loss can go un-noticed until worked hard.
*The fuel cooler front o-ring seal is also another one coolant loss can go un-noticed until worked, but dry coolant can be seen on the engine mount below it. Often this o-ring seal leaks when the engine is stopped or cold.
*Too much of the right foot? Keep in mind a remapped TD5 (and no doubt EGR blanking) tend to increase running temps when worked.
Regards
Daz
P.S either way, you need to get it fixed as a Defender TD5 130 really is ment to be the dependable workhorse recovery vehicle for all the other Land Rover on the road :P
Originally Posted by Tombie
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