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Jun 14th, 2026
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Joined: Jun 2011
Posts: 106 Likes: 1
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Jun 2011
Posts: 106 Likes: 1 |
My Morgan dealer suggested also first to change the coolant cap. Then we will see... During my next drive I carry bottles of water with me, just in case...
Morgan Roadster 3.7
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Joined: Jan 2013
Posts: 472
Learner Plates Off!
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Learner Plates Off!
Joined: Jan 2013
Posts: 472 |
...
What's also funny. The temperature gauge was at boiling never above the central display area. If the cooling water is leaking from the pressure relief valve, it ought to be hotter than normal, and the cooling water thermal display should get into the red zone. But it didn’t…
Has anybody an idea?
If the system is unpressurized due to a failing cap the temperature will never exceed 100 deg Celsius. The differenece at high altitude is small and the gauge is probably not accurate enough to show it. Another thing is at what temperature the fan is engaged. On my 4/4 it was quite a bit over 100 deg if I remember correctly - a problem if the pressure doesn't hold...
Last edited by Lecat; 24/06/14 09:44 AM.
-99 4/4, 1.8 Zetec, Indigo Blue, 2-seat, Suplex RS
-04 Citroen Pluriel, 1.6 Sensodrive, Met Orange
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Joined: Jun 2011
Posts: 106 Likes: 1
L - Learner Plates On
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OP
L - Learner Plates On
Joined: Jun 2011
Posts: 106 Likes: 1 |
...
What's also funny. The temperature gauge was at boiling never above the central display area. If the cooling water is leaking from the pressure relief valve, it ought to be hotter than normal, and the cooling water thermal display should get into the red zone. But it didn’t…
Has anybody an idea?
If the system is unpressurized due to a failing cap the temperature will never exceed 100 deg Celsius. The differenece at high altitude is small and the gauge is probably not accurate enough to show it. Another thing is at what temperature the fan is engaged. On my 4/4 it was quite a bit over 100 deg if I remember correctly - a problem if the pressure doesn't hold... If the cap has a failure, your right. But if the water really was higher than 100 degrees Celsius (this was my first thought, because it boiled) then the temperature display shows the wrong state. So at the moment I'm really not sure which element (temp. display, cap, temp sensor etc.) I can trust...
Morgan Roadster 3.7
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Joined: Jan 2013
Posts: 472
Learner Plates Off!
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Learner Plates Off!
Joined: Jan 2013
Posts: 472 |
I see your problem... I'd start with the cap and check if it's possible to raise the temp to above 100 deg without problems (minding the danger of boiling water coming out  ).
-99 4/4, 1.8 Zetec, Indigo Blue, 2-seat, Suplex RS
-04 Citroen Pluriel, 1.6 Sensodrive, Met Orange
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Joined: Jul 2007
Posts: 27,807 Likes: 749
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jul 2007
Posts: 27,807 Likes: 749 |
Probably the system was pressurised then the cap failed and the pressure release would cause it to flash off
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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