Vehicle & Technical > Defender

Cooling system doing my head in

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Bob696:
I put my 90 (200Tdi) on the motorway and the temp guage starts to go up. 50-70MPH dosnt matter. On friday night it only got as far as about 90% but it is still annoying.
Spent all day driving lanes and minor roads on sat. and the temp gauge never moved (6 hours driving!)
Came home on the A roads frequently crusing at 55-60 and no reaction from temp guage except when I got on some steep hills within a mile or 2 of home.
Cooling system has been flushed twice (2nd time with some rad flush in), rad has been cleaned, heater is bypassed, guage changed, sensor changed and no thermostate is fitted at all.

So whats to do next?

Wolfie:

--- Quote from: "Bob696" --- no thermostate is fitted at all.
--- End quote ---


No thermostat is not a good idea as it can adversely affect the water flow around thw engine, the system is designed to have the restriction in there.

So I'd suggest a new one as the first stage.

I've suffered from hot running in H recently, but whilst towing M on a trailer. Coming back from scotland it got so hot that I decided to take the spotlights off the front. Looking at your photos I see you have some large spots, might be worth removing them until the weather cools down a bit.

Regards

Wolfie

ian_s:
i'd say to inspect the water pump, and see just what state its in.
i had a problem with an old astra once, took the water pump out and it only had 1 vane left
no wonder it didnt work too well

Hangover:
It's the rad mate,you can't clean them out as the crap just gets stuck in there,it won't be the water pump they hardly ever go.

Ollie:
I had exactly the same thing happen a few months ago.
I changes the water pump and thermstat, and re-flushed the coolant, will the same problem.
Would  work fine, then for no reason pump up to 80%.
I re-flushed the coolant and since then, (three months nearly), the problem hasn't re-occured.
I have even bought an electric fan, but haven't fitted it yet as I don't want to upset the balance!

Ollie

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