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temperature sender explanation

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Bob696:
I have had an on going over heating problem (well the temp gauge reads high) which has got worse since I started messing.

Everything seems to check out. Radiator is clean, changed the temperature sender unit, changed the header tank, changed the thermostat.

Heres the interesting thing I found today whilst comparing the new thermostat with the old one. The 'old' one was from a 2.5N/A engine (82 degrees) and the new one is 88 degrees?

So several questions

1) Does the temperature sender unit in the engine send an electrical signal to the gauge on the dash which the gauge then displays? If this is the case could it be possable that the gauge is calibrated wrongly e.g. it is from a 2.5 N/A defender and it is mismatched with the sender unit so the only way to get the correct reading was to fit a thermostat from a 2.5N/A and therefor 'fool' the gauge.
OR
Does the temp sender unit send a preset signal to the gauge when it is at the correct temp and it wont really matter which gauge is fiitted?


2) What are the implications of running a 200Tdi 6 degrees cooler than it should be.

I hope all of the above makes some sort of sense  :shock:

drmike:
I think you may well have mismatched sender and guage. I can't see that it's got anything to do with the thermostat which just opens and closes at set tempretaures and everything to do with how the guage inerprets the information from the sender. But no doubt someone more knowledgeable will be along shortly.
Mike

Bob696:
well I was thinking the thermostat may come into it if it is keeping the water cooler than it should be and therefor leading to a false reading ... its all very confusing :oops:

drmike:
Hold on Bob I didn't buy a set of springs off you did I?

Personally when my own LR showed it was running very hot I opened the bonnet and smelt the engine. In my experience a truly hot engine smells of hot oil and also makes that nasty ting noise as very hot parts cool down.

I had an air lock which was causing the water around the sender to get too hot and hence make it look like the engine was overheating. That said I went home on the back of an AA truck and fixed it rather than risk boiling up!

Mike

Bob696:

--- Quote ---Hold on Bob I didn't buy a set of springs off you did I?
--- End quote ---


I think so ... well somebody did  :lol:

The engine isnt getting that hot ...its just damned annoying and I dont like the idea of not having accurate information. If it gets really hot at the moment how will I know except when the engine goes BANG  :oops:

p.s. Hope the springs suited

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