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Old 04-02-2013   #1
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Broken thermostat - Is it difficult to change?

The engine temperature on my 8v MJet rarely gets above the first mark on the gauge so I assume that the thermostat is broken.

Is it an easy an thing to change?
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Old 04-02-2013   #2
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Re: Broken thermostat - Is it difficult to change?

Brian, I changed mine on my 8v a couple of years ago, it comes with the housing and cost me 63 then from the Fiat dealer. As for changing it it is tricky rather than difficult with a few parts in the way, it took me about an hour, I had to remove the battery and tray to get access.
Ironically it was not faulty, my engine was overheating but my problem turned out to be the water pump which was caused by the plastic impeller coming off the shaft.

PS, have you considered it may be the sender unit? that comes with the new thermostat as well.
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Last edited by bobbyblue; 04-02-2013 at 20:03.
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Old 04-02-2013   #3
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Re: Broken thermostat - Is it difficult to change?

Hi BobbyBlue,
I hadn't thought about the sender unit being at fault.

Do you know if there is any way to tell whether it's the thermostat or the sender unit?
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Old 04-02-2013   #4
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Re: Broken thermostat - Is it difficult to change?

Brian, I'm not much of an electrician, in the old days you could earth out the sender wire and it would shoot the guage into the red, I don't know if that works with modern body computer systems, the thermostat itself can only be tested by putting it into hot water and observing it but I think it is a lot of work if the car is running ok. My car takes ages to warm up in the cold weather with the heater not blowing hot air for about the first 5 miles.
Sorry I can't be of more help, maybe one of the more electrically minded people on the forum can suggest something, I am sure the sender must have a resistance value to check when the engine coolant is up to temperature.
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Last edited by bobbyblue; 04-02-2013 at 20:45.
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Old 05-02-2013   #5
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Re: Broken thermostat - Is it difficult to change?

I had the same problem, engine took very long to warm up, then if I went downhill the temp dropped significantly in just in one mile and there was a little drop in mpg. Replaced the thermostat and now its all good, at 5 degrees it takes 2 miles to warm up. To be sure that, thermostat is the problem, after you start the car and run it a little (2-3 miles) to let the temp go up a bit, raise the bonnet and put your hand on the radiator. If the radiator is warm, then replace the thermostat. If the radiator is cold, then you have a sensor problem, but my guess is on the thermostat which is blocked on open. They usually break way more often than the sensors. Good Luck!
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Last edited by Roberto Blanco; 05-02-2013 at 06:59.
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Old 05-02-2013   #6
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Re: Broken thermostat - Is it difficult to change?

Hi Roberto,
That seems like a really straightforward test, thank you

I'll give it a bash and see what happens.

When the weather is in any way cold, as it is at the moment, it takes ages for the car to heat up, if it even heats up at all so it would be good to get it fixed.
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Old 05-02-2013   #7
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Re: Broken thermostat - Is it difficult to change?

Hi Brian, you`re welcome . Yes indeed it is a good test, never failed and the price of the thermostat is nothing compared to the health of your car and wallet
Cheers !
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Old 05-02-2013   #8
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Re: Broken thermostat - Is it difficult to change?

If it's as horrible as on a 16v then it's a surprisingly big job.

You'll need a box of 10 jubilee clips, as the ones fitted are use-once ones. I think there's a special tool for them, but I don't think you can re-use them anyway. I just levered/broke them off and replaced with bog-standard jubilee clips.

I got the right size for the numerous smaller tubes. I think I had to use two end-to-end to go round a bigger tube. It all worked.

I think it's called a thermostat assembly - the thermostat itself is buried in what is basically a junction between a load of different tubes.
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Old 05-02-2013   #9
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Re: Broken thermostat - Is it difficult to change?

Yeah, I did it about three weeks ago. A huge amount of ripping to get at the thermostat. Most of the EGR plumbing, which is all stainless steel, has to be moved. One particular 10mm stud on a 13mm bolt nearly made me cry! It's the bottom of two on the stat. Patience and bandaids but a definite sense of achievment and a much warmer and economical car. Thermostat cost me €80 inc VAT (Ricambi Originale)
As Bobbyblue says, battery and tray must come out and as Doofer says loads of jubilee clips

I'm glad it's done!!
Hope this helps
CJLAR
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Old 05-02-2013   #10
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Re: Broken thermostat - Is it difficult to change?

Wow, sounds like I'm letting myself in for a bit of a nightmare!

I remember when the thermostat went on my Mk1 Fiesta, not quite such an ordeal to change that one

Thanks once again to everyone. I'll have a serious look at what's involved before I buy anything.
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Old 05-02-2013   #11
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Re: Broken thermostat - Is it difficult to change?

Yes I know, thermostats in the past were like changing a light bulb.

God knows why it's like it is, but it's integrated into a huge lump of plumbing. It's within the scope of DIY (well I managed it anyway), but it's a lengthy and time consuming little project.

I followed the eLearn instructions, which includes details of how to flush the air out - it is automatic, but you have to ensure you get it hot for long enough, which might be difficult at this time of year outside - I did mine in the summer. You could probably just go for a shortish drive to flush it though, just keep an eye on it for a week or so.

Mine ran like crap when I first had it. It rattled like it was cold constantly (not surprising really, as it WAS cold). I fixed mine a couple of years ago and it's been great ever since. The big bonus is that the heater and/or climate control will start working properly as soon as it's fixed.
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Old 06-02-2013   #12
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Re: Broken thermostat - Is it difficult to change?

The 'problem' with modern common rail diesel engines is that they are so efficient. A higher proportion of the heat generated by combustion actually goes towards moving the pistons up and down, less waste heat means a longer warm up time, many diesels now offer a supplementary PTC heating system to back up during cold starts, a price we have to pay for good fuel efficiency I think.
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Last edited by bobbyblue; 06-02-2013 at 18:59.
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Old 08-09-2013   #13
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Re: Broken thermostat - Is it difficult to change?

Quote Originally Posted by cjlar View Post
Yeah, I did it about three weeks ago. A huge amount of ripping to get at the thermostat. Most of the EGR plumbing, which is all stainless steel, has to be moved. One particular 10mm stud on a 13mm bolt nearly made me cry! It's the bottom of two on the stat. Patience and bandaids but a definite sense of achievment and a much warmer and economical car. Thermostat cost me 80 inc VAT (Ricambi Originale)
As Bobbyblue says, battery and tray must come out and as Doofer says loads of jubilee clips

I'm glad it's done!!
Hope this helps
CJLAR
Well I've got as far as the metal tube thing attached to the thermostat thread. I've got the pipes off at either end as well as the hose. Is there anything else holding it in place or do I just need to keep working away at it?

Got the bandaids to show for it as well
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Old 08-09-2013   #14
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Re: Broken thermostat - Is it difficult to change?

I've undone everything I can find and still can't get that metal tube off the thermostat stud.

Besides the egr pipework, the 10mm nut and the hook is there anything else that holds the metal tube thing in place at the back?
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Old 08-09-2013   #15
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Re: Broken thermostat - Is it difficult to change?

Not sure Brian. Did you get the 13mm stud between the stat and the stainless plumbing? No room to operate there; I had to cut an open ended 13mm in half to make a stubby one.
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