overheating td5

[rangietragic]

Had to tow my sons d1 to a mechanic about an hour away today,on a heavy trailer.After about half an hour the temp gauge went into the red and came back to normal again,all within about 15 to 20 seconds.Keeping speed to 90-95 kays every 10 mins or so i would hear a "toot" and temp would shoot up and straight back to normal again.After hitting 90 zone and keeping to about 80 kays no more problems.Off loaded disco,added about a litre of water and towing just the trailer at 100 odd kays guage never moved all the way home.Chipped TD5 130 with 3" straight exhaust.:confused:

[DazzaTD5]

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

[Tombie]

Even simpler...

My 2001 Defender did exactly as described after a week playing in the High country mud...

Was as simple as cleaning the radiator / IC

[rangietragic]

Even simpler...

My 2001 Defender did exactly as described after a week playing in the High country mud...

Was as simple as cleaning the radiator / IC

Have a feeling could be air in system,ran low on coolant and got hot a month or two ago when heater core sprang a leak.Heater has been bypassed since then.