Vehicle & Technical > Defender

overheating 300TDi 110

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Ollie:
Laila is getting very hot, an a motorway at 50mph I just manage to keep her running under the red.
As I slow down, she then starts to cool down, the faster I go, the hotter she gets.

I've just stripped out the water pump and thermostat, both look nearly new, but I have replaced them anyway. This obviously isn't the route cause of the overheating, so then what is????? :(bigshock):

There's no water leak, I replaced the 'P' gasket a few months ago and therefore the coolant has been replaced, the oil and filter are changed every 5K miles, and there's plenty there. I've had the rad out and flushed it through with the hose, so no blockages, and it's in good nick.

The only thing I have done is add a full length intercooler, but this was done months ago, and she's covered a few thousand miles on and off road since then. I didn't up the fuel pump pressure, but I'm told diesels run cooler with a weaker mix.

So, I throw it out to the panel, any suggestions?

Cheers
Ollie

Thrasher:
Take the oil filler cap off and listen - is it chuffing?

When the head went on my old Granada it was exactly the same as you describe :( Would run all day under 50...but take it over that and up went the needle.

Ollie:
Neil,
I have looked at the oil filler cap, and I would have thought that there would be some discolouration or white foam, but its clean?

She's in pieces on the drive at the moment, I'll get her back together this eveing and check for 'chuffing'.
I hope it isn't, that's a rather expensive repair :(bigcry):

Ollie

Ollie:
Could it be the Viscous fan? Can these fail? Is there anyway to test it?


Ollie

ChrisW:
The viscous fan is a possibility however I have experienced similar with my 300 in a Disco and understand that the viscous fan is useful upto about 30-40mph, above this speed and the air is forced through the rad quicker than the fan could pull it through anyway which kind of stuffs that theory altogether!

I have also heard that the radiators can block up/rot internally over a few years and either a recore or replacement is the only option.

What kind of off roading has it had? I 'back hosed' (hose pipe and flush through the rad fins from the engine side out) mine and probably got about half a bucket full of sand/silt - easier if you can do it with the rad off the car.

DON'T try and pressure wash the rad - you'll just bend all the fins over and stuff it completely!

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