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Temperature reading too low? #274199
12/05/15 08:18 PM
12/05/15 08:18 PM
Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
BertR Offline OP
Talk Morgan Regular
BertR  Offline OP
Talk Morgan Regular

Joined: Dec 2009
Posts: 741
Aerdenhout, The Netherlands
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


2009 Roadster, Lancia midnight blue, cinnamon upholstery.
Re: Temperature reading too low? [Re: BertR] #274207
12/05/15 08:26 PM
12/05/15 08:26 PM
Joined: Jan 2012
Posts: 14,976
Perth, WA, Australia
Richard - Aus Offline
Member of the Inner Circle
Richard - Aus  Offline
Member of the Inner Circle

Joined: Jan 2012
Posts: 14,976
Perth, WA, Australia
Do newer cars still have voltage regulators/stabilisers?


Richard
1976 4/4 4 Seater
Re: Temperature reading too low? [Re: BertR] #274227
12/05/15 09:03 PM
12/05/15 09:03 PM
Joined: May 2011
Posts: 4,896
Seaton, Devon, UK
AJSki2fly Offline
Drive on the Wild Side
AJSki2fly  Offline
Drive on the Wild Side
Part of the Furniture

Joined: May 2011
Posts: 4,896
Seaton, Devon, UK
Temp gauges are notoriously inaccurate, go on the thermo couple readings, I believe that fan kicking in at 95c is about right.


Adrian
Mercedes SL350
Previously
"Rosie in Blue" (Aero S1)
Red Rosie (3.7 Roadster)
Rosie the Plus 8
Re: Temperature reading too low? [Re: AJSki2fly] #274229
12/05/15 09:05 PM
12/05/15 09:05 PM
Joined: Jan 2012
Posts: 14,976
Perth, WA, Australia
Richard - Aus Offline
Member of the Inner Circle
Richard - Aus  Offline
Member of the Inner Circle

Joined: Jan 2012
Posts: 14,976
Perth, WA, Australia
Originally Posted By AJSki2fly
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 smile


Richard
1976 4/4 4 Seater
Re: Temperature reading too low? [Re: BertR] #274276
13/05/15 06:43 AM
13/05/15 06:43 AM
Joined: Aug 2013
Posts: 2,879
Solihull
Spanner Juggler Offline
Talk Morgan Expert
Spanner Juggler  Offline
Talk Morgan Expert

Joined: Aug 2013
Posts: 2,879
Solihull
Originally Posted By BertR
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
Re: Temperature reading too low? [Re: BertR] #274347
13/05/15 04:21 PM
13/05/15 04:21 PM
Joined: Aug 2011
Posts: 885
Aberdeenshire
E
Eddie Cairns Offline
Talk Morgan Regular
Eddie Cairns  Offline
Talk Morgan Regular
E

Joined: Aug 2011
Posts: 885
Aberdeenshire
These days guages are nothing more than part of the in car entertainment system.

Re: Temperature reading too low? [Re: Eddie Cairns] #274412
13/05/15 09:28 PM
13/05/15 09:28 PM
Joined: Jun 2014
Posts: 11,222
Lancashire, England
Stewart S Offline
Wave & smile... It's a Morgan
Stewart S  Offline
Wave & smile... It's a Morgan
Member of the Inner Circle

Joined: Jun 2014
Posts: 11,222
Lancashire, England
Originally Posted By Eddie Cairns
These days guages are nothing more than part of the in car entertainment system.


rofl


2008 XXVII Platform, Bugatti Blue Roadster 4 Seater

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