Thread: Defender TD5 Over heating Issues

Thats a normal occurrence, hot air is less dense and less density means less bang.

When was the cooling system last professionally flushed?

Start there - may need a new radiator depending on age (they aren't that expensive)

I have a TD5 defender which has a loose connection on the fuel pump relay - I know how to fix it but I get way more enjoyment out of making gullwings, an ex box, shelves and the like to fix it.

The point is, when the connection isn't there (so no electrical circuit) the symptoms are the temp gauge goes to hot. This usually happens when I am starting the car, but when it happens and I am driving, power will cut out, temp will spike up then return - with the check engine light coming on. Nanocom is always on in instrument mode so I can see the spike. No fault is listed either.

Not saying it's the cause, but those symptoms are similar to mine.

Get your hands on a nanocom and watch the actual temp, not the temp on the gauge (it stays in the middle until 115 from memory) so useless for you to diagnose the issue.

Thanks. Sounds like a possibility. I will also flush the system, change temp sender unit and thermostat to make sure.