Qashqai 2019 1.3 engine problem after thermostat replacement

Forum for Engine, Exhaust, Drivetrain, ECU
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phatboy
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Post by phatboy »

Howlsatthemoon wrote: Mon Jan 13, 2025 5:57 pm [quote
We don’t need to modify the thermostat housing itself; it has the same size and shape. Both cars have the same engine, and the bolts are in the same position. We just need to adapt the hoses.
It’s not an impossible task; someone has already managed to do it.
3 weeks later and it still isn't fitted :roll: :roll:
[/quote]

You're very negative, you know you can just unfollow this thread if you don't like it?
2018 Qashqai Tekna + DCT Dig-T 160

Howlsatthemoon
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Post by Howlsatthemoon »

phatboy wrote: Mon Jan 13, 2025 6:15 pm You're very negative, you know you can just unfollow this thread if you don't like it?
Not negative just being realistic. I am entitled to my opinion just the same as everyone else on this forum. It's just after getting the Mercedes thermostat 3 weeks ago the poster is still looking for adaptors, hoses etc. with no guarantee it will work. If it does work well good luck to him, I certainly won't be doing what he has done, as I said it is easier to just change thermostat every 2 - 3 years if you intend to keep car.
1CaDo1978
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Post by 1CaDo1978 »

Howlsatthemoon wrote: Mon Jan 13, 2025 5:57 pm [quote
We don’t need to modify the thermostat housing itself; it has the same size and shape. Both cars have the same engine, and the bolts are in the same position. We just need to adapt the hoses.
It’s not an impossible task; someone has already managed to do it.
3 weeks later and it still isn't fitted :roll: :roll:
[/quote]

It’s not a documented procedure; it’s logical for Ersin to proceed with caution.

He needs to adjust the pipes and take all the time he needs. If he doesn’t succeed, never mind; at least he tried! You’re not being helpful with this comment.

Why change the thermostat every 4 years? If it was a batch of defective parts, simply installing a new one should suffice to be reasonably safe. There isn’t much information around regarding failures with the new model. We know that it was produced by another company. I would install the new thermostat and add a simple coolant level sensor to potentially limit any damage.

Attempting to adapt the Mercedes thermostat housing is not a waste of time; the engines are the same, but the thermostat housing has been significantly reinforced at potential failure points, indicating that Mercedes aimed to strengthen both the internal and external aspects of a part prone to breaking. This modification has been successfully performed before, but it hasn’t been documented for quick replication. One needs to find the appropriate fittings and hoses; once that’s done, it won’t be much more complicated than installing the Renault/Nissan thermostat. When cross-sectioned, the two thermostats are interchangeable.
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lapalmeraie
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Post by lapalmeraie »

Let's remain positive and constructive, but with place for everyone's opinion ;)

It's not an off-the-shelf solution and thus not a quick fix.

Let's also remain to the facts only.

It's assumed that the faulty part was produced elsewhere, but is there any proof of this? On only red the "assumption", as the Mercedes "clips" that appeared to be wrong as well.
It's also uncertain that this part needs preventive change every "X". Every 3 years seems unnecessary as there are no occurrences signalled after 2020.

This is what I have right now:

Image
Image
Image

So mostly 2019, which could support the faulty production theory.
Spread over EU (but I think most of these QQ's are produced in the same factory?)
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phatboy
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Post by phatboy »

lapalmeraie wrote: Tue Jan 14, 2025 7:57 am So mostly 2019, which could support the faulty production theory.
Remember, 2018 the engine was only available for 3 months (Introduced in October), so you could potentially x4 the impacted cars from this year, as a rough estimate of failure rate?
2018 Qashqai Tekna + DCT Dig-T 160
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lapalmeraie
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Post by lapalmeraie »

Well, if aging was the real issue for all these thermostat housing, ALL 2018 should have broke open by now...
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Bats32
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Post by Bats32 »

lapalmeraie wrote: Tue Jan 14, 2025 10:10 am Well, if aging was the real issue for all these thermostat housing, ALL 2018 should have broke open by now...
Surely by now we would've heard of 2020+ cars having the problem? It does seem limited to the 2019era model. Nissan would also be stupid not to rectify the problem (because they obviously know about it) which they *appear* to have done with the new part number in some way?
Ersin
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Post by Ersin »

Almost done.
I bought all the necessary parts.
It Must used only the connectors, not the whole hoses.
Now, I have to find a good mechanic to fit all parts.
I'm in no rush for this, I don't have any problems with my car. I do this just preventive.

Screenshot_2025-01-15-13-28-14-496_com.miui.gallery.jpg

IMG_20250115_133706.jpg

1CaDo1978
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Post by 1CaDo1978 »

Fingers crossed 🤞 good luck
osvaldo.przgl
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Post by osvaldo.przgl »

Ersin wrote: Wed Jan 15, 2025 11:44 am Almost done.
I bought all the necessary parts.
It Must used only the connectors, not the whole hoses.
Now, I have to find a good mechanic to fit all parts.
I'm in no rush for this, I don't have any problems with my car. I do this just preventive.
Good job!
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