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Wales
by Joske Vermeule, September 1
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Forums39
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Posts838,213
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Most Online1,063
Jun 14th, 2026
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Joined: Dec 2009
Posts: 1,005 Likes: 31
Has a lot to Say!
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OP
Has a lot to Say!
Joined: Dec 2009
Posts: 1,005 Likes: 31 |
Last autumn I reported on this forum, that a plastic radiator part had cracked on my Roadster (2009). I decided to go for an aluminium radiator from Mulfab. The replacement, triggers one to look at the temperature gauge more often. It struck me how low it actually reads; normally it reads well below 80 C, more like 75 C.
I decided I wanted to know more and after a drive I stuck a thermocouple between the coils of the radiator and measured 90 C. After idling for a few minutes, the fan switched on at 95 C.
The measured temperatures look normal too me. Can anyone on the form confirm the temp values I measured?
My conlusion is that temp gauge just reads about 15 C too low. Has anyone seen this before and can this be easily corrected?
Thanks for thinking along!
Kind regards,
BertR
2025 Plus Six - 1909
2009 Roadster
1983 4/4 4str
Board member Morgan Sports Car Club Holland ('21)
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Joined: Jan 2012
Posts: 14,976 Likes: 2
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jan 2012
Posts: 14,976 Likes: 2 |
Do newer cars still have voltage regulators/stabilisers?
Richard
1976 4/4 4 Seater
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Joined: May 2011
Posts: 4,896
Drive on the Wild Side Part of the Furniture
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Drive on the Wild Side Part of the Furniture
Joined: May 2011
Posts: 4,896 |
Temp gauges are notoriously inaccurate, go on the thermo couple readings, I believe that fan kicking in at 95c is about right.
Adrian
Buggered Off, to a modern none leaky car, heart's still ticking
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Joined: Jan 2012
Posts: 14,976 Likes: 2
Member of the Inner Circle
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Member of the Inner Circle
Joined: Jan 2012
Posts: 14,976 Likes: 2 |
Temp gauges are notoriously inaccurate, go on the thermo couple readings, I believe that fan kicking in at 95c is about right. Morgan seem to have forgotten this with mine just being cold, normal and hot 
Richard
1976 4/4 4 Seater
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Joined: Aug 2013
Posts: 3,383 Likes: 14
Talk Morgan Addict
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Talk Morgan Addict
Joined: Aug 2013
Posts: 3,383 Likes: 14 |
Last autumn I reported on this forum, that a plastic radiator part had cracked on my Roadster (2009). I decided to go for an aluminium radiator from Mulfab. The replacement, triggers one to look at the temperature gauge more often. It struck me how low it actually reads; normally it reads well below 80 C, more like 75 C.
I decided I wanted to know more and after a drive I stuck a thermocouple between the coils of the radiator and measured 90 C. After idling for a few minutes, the fan switched on at 95 C.
The measured temperatures look normal too me. Can anyone on the form confirm the temp values I measured?
My conlusion is that temp gauge just reads about 15 C too low. Has anyone seen this before and can this be easily corrected?
Thanks for thinking along!
Kind regards,
BertR I have owned 2 2008 +4's at different times, both are as you report, a friend recently bought a 2007 and it's the same, another has a 2011 car and his is identical. Two of us have Mulfab radiators and the dash gauge reading is the same. Everything points to an under reading gauge. We all just use it as a crude guide and not to be trusted, a little like the fuel gauge, the time to worry is when it reads above the 'normal' daily reading.
BR Colin
Who used to be a Spanner Juggler
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Joined: Aug 2011
Posts: 898
Talk Morgan Regular
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Talk Morgan Regular
Joined: Aug 2011
Posts: 898 |
These days guages are nothing more than part of the in car entertainment system.
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Joined: Jun 2014
Posts: 11,616 Likes: 43
Wave & smile... It's a Morgan Member of the Inner Circle
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Wave & smile... It's a Morgan Member of the Inner Circle
Joined: Jun 2014
Posts: 11,616 Likes: 43 |
These days guages are nothing more than part of the in car entertainment system. 
2008 XXVII Platform, Bugatti Blue Roadster 4 Seater
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