Thread: 300 tdi Defender overheating ?

Timing is fine, have just changed belt etc, but no change in getting warm. Doesn't seem to matter, fourth or fifth gear, still climbs at to the 3/4 mark sitting on 85-90kmh.

Summing it up, I have replaced everything to do with the cooling system, even the heater element, but no change to the symptoms. I will test the coolant for exhaust gases though it doesn't use any coolant so cant be anything major. Will install a more accurate temp gauge and monitor.

I'm pulling the engine out this weekend to replace clutch so a closer look at air flow will be good.

Cheers

Originally Posted by djam1

For the benefit of those in the future

We installed a Dayco Thermostat DT50A 82 degrees C
The tropical modification for the radiator (partially blocking off the half inch bypass hole in the radiator) for reference as a proof of concept we used a tubeless valve stem that had been shortened and the valve removed pushed on a piece of rod into the hole.
This will be soldered up in the future apart from a 2mm hole

The end result is its much better probably 5 degrees cooler on average

Ongoing testing will be done next week when the vehicle is used out bush.

Seems like a good result. Can you tease out the individual effects of the new thermostat and the modded radiator?

Just re the tubeless valve stem - I assume you had to pull the radiator apart to fit that? If not can you give more detail on how you did that please?