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post #1 of 12 (permalink) Old 14-05-2008, 19:11 Thread Starter
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Temp Issues

Hi, i have a 200 '98 1.4 petrol k series.

I have had some strange temperature behaviour.

The needle gets up to 1/4 on the guage and stays there unless i sit in traffic where it rises to half way and stays there until i get up to speed again.

i changed the thermostat (AAARRRGGGHH!!!) and flushed and bled the system and all was fine dor a month.

Now it has gradually returned to the same state as before.


Could the thermostat have gone again or could i have other problems?




thanks in advance for any help.
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post #2 of 12 (permalink) Old 14-05-2008, 19:53
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You could try changing the gauge sender unit. It is the small temperature sensor thing under the coolant outlet.
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post #3 of 12 (permalink) Old 14-05-2008, 20:20
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yea as above try cahnging the ECT sensor only 8 or 9 quid out of a motor factors worth a try
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post #4 of 12 (permalink) Old 14-05-2008, 20:32 Thread Starter
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cool, will do, i certainly dont fancy replacing the thermostat again

I wondered if the sensor had gunk on it preventing it from operating correctly.

I need to sort it soon cos im probably using an extra tenner a week in fuel as the car thinks its still cold all the time
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post #5 of 12 (permalink) Old 14-05-2008, 21:03 Thread Starter
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Quote:
Originally Posted by davy800 View Post
yea as above try cahnging the ECT sensor only 8 or 9 quid out of a motor factors worth a try

which one is the ect sensor?

Theres two isnt there, one for the guage and one for the ecu.

Id presume the guage is working correctly as i have poor fuel consumption indicating misreadings going to the ecu
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post #6 of 12 (permalink) Old 17-05-2008, 18:07 Thread Starter
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Update:


Ok, so i put some wash powder in the coolant and ran it till it was hot, then after it cooled i drained and flushed the coolant. Water ran clear with no gunk whatsoever.
Ive bled it and ran it to see how the temperature was behaving.

Still no change......it takes ages to get hot and if im moving the temperature drops to a quarter.


I did notice the fan wasnt kicking in and if i remove the brown sensor connector the fan kicks in and stays on whether the engine is hot or cold.
So the fan works but just doesnt come on when its supposed to.


Could it be another faulty thermostat? as that seemed to fix it temporarily last time. it only lasted a couple of days if this is the case.



Any help or advice greatly appreciated.
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post #7 of 12 (permalink) Old 17-05-2008, 18:21
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It could take a good 40 mins at idle for the fan to kick in depeing on the condition of the rad.

My little GSI 100 fan kicks in at half way on the guage and nothing is wrong with it. New sensors, rad and water pump. But it does not over heat or drink fuel so I have put it down to an iffy guage or a super efficient cooling system.

Aslong as it all works dont panic.
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post #8 of 12 (permalink) Old 17-05-2008, 19:07 Thread Starter
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Quote:
Originally Posted by Sejin26 View Post
It could take a good 40 mins at idle for the fan to kick in depeing on the condition of the rad.

My little GSI 100 fan kicks in at half way on the guage and nothing is wrong with it. New sensors, rad and water pump. But it does not over heat or drink fuel so I have put it down to an iffy guage or a super efficient cooling system.

Aslong as it all works dont panic.

Thanks for your advice.

After the very expensive hgf 5 months ago, every little cooling related thing makes me panic lol
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post #9 of 12 (permalink) Old 17-05-2008, 19:18
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I'd have another look at the thermostat and make sure the return to the expansion tank isn't blocked.
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post #10 of 12 (permalink) Old 17-05-2008, 19:20 Thread Starter
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Quote:
Originally Posted by empsburna View Post
I'd have another look at the thermostat and make sure the return to the expansion tank isn't blocked.

ok, im sure the return is ok as i witnessed coolant being returned.

Could the thermostat be in the wrong way round? Im not sure if thats possible but ya never know.
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post #11 of 12 (permalink) Old 17-05-2008, 19:23
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I'd still whip it out and check it.
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post #12 of 12 (permalink) Old 17-05-2008, 19:28
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If the temperature behaved as normal after changing the stat, but has now deteriorated, perhaps there is something in the system that is causing it to stick open. I would try changing the stat again and flushing the system. (easier with the inlet manifold removed)
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