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Old 23-09-2013   #31
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Re: Broken thermostat - Is it difficult to change?

Radiator draining etc. catchable and recoverable however I'm really struggling to remember if the Croma engine block has an engine block drain plug? Must be old age as I'm trying to remember back to when I did the water pump. Something tells me I drained the radiator via a lower drain tap but the block got drained when the water pump was detached.

Not to worry as I have full notes, eLearn etc and when I get my head back under the bonnet I'm sure I'll inspect, see and remember......hopefully.

My reluctance to dive in at this stage is because all I'm seeing/noteing is what I would call a lethargic thermostat to close down fully (safe mode of failure).

Also checked this afternoon and my local parts supplied has the thermostat housing in stock for a modest 29 retail inc. VAT (I get trade pricess anyway so will be less than this).

A firm failure will see me get the job done asap but at the moment I've so much other stuff on my plate it is more of niggling status query than a real concern or worry.
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Old 24-09-2013   #32
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Re: Broken thermostat - Is it difficult to change?

A firm "don't know" from me I'm afraid, but I do remember that I didn't get much out from the radiator drain when I did mine. It emptied enough to change the thermostat without mess, but didn't need much refilling. So it was fine as far as changing the thermostat went, but I didn't count it as a coolant change.
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Old 24-09-2013   #33
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Re: Broken thermostat - Is it difficult to change?

Thanks Doofer

Just looked on eLearn and they only talk about draining the rad. All coming back to me. Also looking at the pictures/diagrams it is a straight run down from the main thermostat vent directly to the bottom hose so the block should drain to stat level and then only dribble out.

Also they suggest removing the engine under tray and some pipework. I won't mess around when I do change the stat. Will be ramps out, nose up and undertray off. Least that way I'll get decent rear side visibility and access even if I don't need it.
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Old 24-09-2013   #34
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Re: Broken thermostat - Is it difficult to change?

I lost 2 litres of fluid disconnecting and removing everything that I did so it's not the end of the world if there's not an easy way to save it for reuse. Mine needed changing anyway so I didn't even try but with a replacement cost of less than 3 I didn't think it was worth the effort.
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Old 14-11-2013   #35
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Re: Broken thermostat - Is it difficult to change?

Welcome back to the broken thermostat thread!

I changed it for a new one a couple of months ago but a couple of days ago the needle rather than going up to the middle and staying there as it had been it is staying stuck at the left and not moving at all.

The heater's working OK and there doesn't seem to be anything else obviously wrong.

Has anyone got any ideas about what the problem might be this time?
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Old 14-11-2013   #36
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Re: Broken thermostat - Is it difficult to change?

Hey Brian,

If the needle doesn't move at all, then is one of the plugs from the temp sensor on the thermostat. When you changed the thermostat, it possible that you didn't plug it correctly and now its off from the vibrations of the engine. Check the plugs from the both sensors. Good luck !
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Old 14-11-2013   #37
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Re: Broken thermostat - Is it difficult to change?

Hi Roberto,
I checked the connection to the green plug on the thermostat was on tight but I didn't know there was another one.

I changed the nearside headlight at the weekend and did a fair bit of dismantling of the front of the car in the process. Is the other one anywhere near the front / nearside of the car?
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Last edited by BrianMcL; 14-11-2013 at 22:14.
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Old 18-11-2013   #38
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Re: Broken thermostat - Is it difficult to change?

Well the new thermostat's definitely stopped working. Whether that's because it's turned colder all of a sudden or something else has gone wrong I'm not sure.

Other than the stat itself is there anything else that would stop the engine getting up to normal temperature?
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Old 18-11-2013   #39
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Re: Broken thermostat - Is it difficult to change?

I am sorry for my late answer, been gone for few days, no internet. About the second plug thing, I was thinking at my old Fiat Tempra, which had two sensor in the thermostat casing, my bad sorry for misleading you. I have checked my photos taken when I changed the thermostat and yes, the Croma has only one temp sensor there. Did you solved the temp indicator gauge problem ?!
Now regarding the engine not heating up, check the radiator after you run the car for 5-10 min, if it is warm, you might had a bad luck and bought a faulty new Thermostat. It happened to me with an older Renault, so it is not out of the question, but the chances are very low. Check that radiator and if it gets warm or hot before the temp is hitting 90 degrees, then the thermostat is faulty and you should reclaim the warranty. Good luck !
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Old 19-11-2013   #40
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Re: Broken thermostat - Is it difficult to change?

Thanks again for the advice Roberto.

Just checked the radiator after a 20 minute drive in town and the open road and both it and the bottom hose are both cold to the touch. The temperature gauge needle hasn't moved and the air that's coming out the heater vents is warmish but certainly not hot, even set to 32C.
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Old 19-11-2013   #41
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Re: Broken thermostat - Is it difficult to change?

Hey Brian. Don't know what to say now, you should go to a service if someone doesn't have any other ideas. After a 20 min run, the engine should be warm enough even with a broken thermostat. Regarding the temp indicator, the sensor from which he gets the signal its a new one, he came with the new thermostat and if the wiring is ok, it may be faulty, presuming that it worked after you installed the new thermostat and temp sensor. When I bought the new thermostat it came with a new temp sensor. The thermostat was from Wahler.
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Last edited by Roberto Blanco; 19-11-2013 at 22:35.
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Old 20-11-2013   #42
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Re: Broken thermostat - Is it difficult to change?

Hi found this
on you tube
I think my thermostat is on the blink I will give it a go.
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Old 20-11-2013   #43
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Re: Broken thermostat - Is it difficult to change?

Pardon me for butting in.
I have just been on the Eurocarparts site and just out interest I had a look at there types of thermostat.
I noticed that there are one big hose connection and two smaller ones , is it possible that you have got these the wrong way round and generated a Suck v Blow situation?

Not impuning your working practices or owt! but iv`e bored folks to death before about checking the simple things first!

In the past I have had to blush so much with wasting money on car DIY that the quack thought I had bloodpressure
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Old 20-11-2013   #44
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by Telegraph View Post
Hi found this Termostat JTD / Thermostat JTD - cheap replacement / Termostato JTD - sostituzione a basso costo - YouTube on you tube
I think my thermostat is on the blink I will give it a go.
I did that once on my old 2.0 16v gasoline Croma and it was a very bad ideea. After few hundred miles, the not recommended thermostat got stuck on close and my engine was damaged. Lesson learned, I'll never do it again. I'm not saying it will happen the same for you, but I'm not saying that it can't either, but your 30 quid of economy could lead to some big expenses on the long run. I'd buy the necessary part if I were you, is not even expensive. If you want to do this trick for a thermostat, then what you would do if your turbo fails, which is 20 times more expensive ?! This without taking in consideration that you need to dismantle half of the car
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Old 20-11-2013   #45
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by tarquin1867 View Post
I noticed that there are one big hose connection and two smaller ones , is it possible that you have got these the wrong way round and generated a Suck v Blow situation?
If he did that, the engine wouldn't overheat instead of not heating up ?! The heat has to go somewhere...
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