Series 3 Hello - Overheating

I'm form Portugal and I've got a serie 3 2.25 diesel engine (SWB).

Although I searched the forum for help I couldn't find what I needed.

So, my landy have some issues with overheating, in the forum I found another landys with the some problem. The water gaug never stabilizes in "N", i don't have thermostast, in the winter never go above the "N" but in the summer is aways above "N" when climb slight hills or when the wheather is very hot. The pointer never rise above the red.

I change the radiator core, change the water pump, open the engine head and clean everything, put new voltage stabilizer (behind dash) and clean the contacts of the whater gauge. The oil filter and the oil is new also the diesel filter. (the alternator is also new)

The linght of the oil pressure is off and in the eletric scheme don't share the voltage stabilizer of the wahter gauge, only the fuse and is a nwe one (24amp).

I just didn't touch in the diesel pump and the injectores or in the engine block....

Afther that the issue with the reading in the water pump remains and if i use thethermostat the point climb to the red.

My doubt is, the gauge reading it's wrong and i don't have any issue with overheating and if is true how i can despiste that or I have another issue. What can be and how I can despiste.

Some one can help me?

Thanks a lot

so without thermostat fitted it still appears to run hot

Move to Manchester. It will never overheat again.

Many of these problems are with the gauge, not the engine. Try a laser thermostat on the hot engine and radiator to assess the different temperature range over the entire cooling system. Try it when normal then try it when the gauge shows too hot.

Problaby in weather in Manchester solves the issue.

I will try your advice, that you.

jamesmartin said:

so without thermostat fitted it still appears to run hot

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Yes.... probably can be issue in gauge... I read in old manual can be injector nozzle faulty or incorrect injection pump timing, but with that I believe a can't achieve 55 mph..

TiagoVacas said:

Yes.... probably can be issue in gauge... I read in old manual can be injector nozzle faulty or incorrect injection pump timing, but with that I believe a can't achieve 55 mph..

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id look at the gauge and sender,
they can run hot in hot conditions,reducing the hole size in the thermostat to bypass joint can help ,it sends more through the thermostat and so radiator rather than round through the water pump

Thank you for your advice James Martim!
Only a doubt, what you suggest to reduce the bypass hole?

TiagoVacas said:

Thank you for your advice James Martim!
Only a doubt, what you suggest to reduce the bypass hole?

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make a tin gasket with a smaller hole, but if you havent a thermostat fitted so i doubt it would help your case

jamesmartin said:

make a tin gasket with a smaller hole, but if you havent a thermostat fitted so i doubt it would help your case

Click to expand...

Ok thank you.
I will try do 2 aproachs, first test a new gaugue (modern one) with voltage stabilizer included. The other one will be try a laser thermostat...