1 word. It is NORMAL if it goes up to middle mark.
When your temperature needle is showing at this point, it is usually around 90 degs Centrigrade and it's the OPTIMUM engine temperature.
Usually at this point, when it goes slightly above half mark,

i) your radiator fan kicks in, and it takes a while to cool it back to slightly below the middle mark. Again this is Normal.
ii) Your water thermostat has already open fully.

I assume that you are not using the air-conditioning system because whenever your air-cond's compressor kicks in, the fan also spins.

But however please becareful if it's reaching very very close to the first line of the H mark. Pull over if you must.

This post has been edited by SleeplessEyes: Jun 11 2007, 07:07 PM

If I were you, I would not do this option of taking away the thermostat and directly connecting to the fan.
Why? It's very obvious that this solution is not only non-street smart idea (no, I am not insulting your ideas) but its actually running away from the actual problem.

I've got friends who did that too on their Nissan Sunnys.They all fear like TS/garry_npm,with reasons that seeing the temperature needle at half-mark freaks them out.
NO!! At Half mark, it's still at the engine's safe operating temperature,in fact it's optimum temperature, at it is around 90degs Celcius.By then, the water thermostat has open to its maximum, fans should be running.

Usually older designed cars such as Nissan Sunny & Kancils, they run cooler when they are cruising. When you see your temperature needle at 1/4 mark, thats around 75 degs Celcius. Thats where your thermostat should start opening by then and maintaining it there while cruising.

Running a radiator fan permanently all the time serves no advantage at all but more disdvantages to an N/A, unmodified engine.

i) Your engine will run below it's optimum temperature
- Higher fuel consumption
- Higher wear and tear to the engine
- Higher emissions (For those who are really concerned)

ii) Your fan motor will have shorter life

iii) Your engine will take alot longer to warm up to it's optimum temperature
- Higher emissions (For those who are really concerned)
- Higher fuel consumptions.

So if anything obviously beyond 3/4 mark always (or very close to the HOT mark), then you have to check your coolants for dirty or radiator for blockage or check your pressure cap in case it's weak.

P.s- I am a Automotive Engineering student,I know what i am typing,and I hope you trust my words.

This post has been edited by SleeplessEyes: Jun 11 2007, 07:25 PM

Poor ground will not affect just 1 temperature meter. It will make the entire electrical system perform poorly, theorically. That includes your headlamps, radio, etc. Your headlamps will be dimmer and your radio will have poorer sounds.

I just dont see any relations, Ecko, in just affecting 1 meter.

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Added on June 15, 2007, 12:54 pmMy advice, is if you cannot suggest a good solution, then dont bother typing.
Just sit back and observe.

it will only make you look more stupid if you write more silly suggestions.

Yes I know you're gonna say next "This is a public forum and I have all rights to talk and type whatever I wish and whatever I want",
but as I mentioned earlier,
it will only make you look more stupid if you write more silly suggestions

P.s- This is my advice for you. If you take it as a insult, I cant help you on this one.

This post has been edited by SleeplessEyes: Jun 15 2007, 01:00 PM