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Wales
by Joske Vermeule, September 1
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Jun 14th, 2026
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Joined: Aug 2016
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New to Talk Morgan
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OP
New to Talk Morgan
Joined: Aug 2016
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[img] http://tinypic.com/a/abnz1v/4[/img] See images above. Temp gauge is normally halfway between 90 and 140 degrees. When stuck in traffic it goes closer to 140. Seems consistent so I think its a gauge issue. Plenty of coolant - no leaks. Any ideas? Ive got a 300km drive in it tomorrow so that should really test it. Thanks. Dreamon
Dreamon.
1987 4/4
2-seater
1.6 CVH
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Joined: Aug 2014
Posts: 5,587
Charter Member
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Charter Member
Joined: Aug 2014
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Having had temp issues on old classics a temperature measuring device that is pointed towards the offending area and trigger squeezed to get a reading is a very useful bit of kit , need to buy one really !
Geneva 2016 plus 8' The Green Godess' 4 side exits .
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Joined: Aug 2011
Posts: 7,553 Likes: 88
Talk Morgan Guru
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Talk Morgan Guru
Joined: Aug 2011
Posts: 7,553 Likes: 88 |
Is the fan cutting in?
If not, check the relay.
Bud
4/4 "Stanley"
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Joined: Dec 2009
Posts: 37,486 Likes: 992
Tricky Dicky Member of the Inner Circle
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Tricky Dicky Member of the Inner Circle
Joined: Dec 2009
Posts: 37,486 Likes: 992 |
I would suspect the instruments voltage regulator as from what you have said the temperature is not that indicated on the gauge.
2009 4/4 Sport Henrietta
1999 Indigo Blue +8
2009 4/4 Sport Green prev
1993 Con Green +8 prev
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Joined: Oct 2010
Posts: 163
L - Learner Plates On
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L - Learner Plates On
Joined: Oct 2010
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My (former) 1992 plus 4 used to sit at about 90 and then rise when in traffic until the fan cut in, then the temperature dropped until the fan stopped. Your Ford engine will clearly have different temperatures shown as the thermostat temperature will be different but I would expect similar behaviour with no air flow through the radiator.
2008 Plus 4
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Joined: May 2014
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Black Rat Charter Member
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Black Rat Charter Member
Joined: May 2014
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I spent two years and a considerable amount of money chasing an overheating problem on my V6 Alfa Spider until I spent £12 on a infra red temperature gun and realised it was the gauge 
Keith
2013 narrow bodied + 4 Ruby.
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Joined: Aug 2011
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Talk Morgan Regular
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Talk Morgan Regular
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Either go into Maplins or if you have time Ebay and search for IR thermometer.
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Joined: May 2009
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L - Learner Plates On
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L - Learner Plates On
Joined: May 2009
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Remove the temperature probe from the engine , with it still connected to the gauge and ignition on put it in a large container of boiling water to determine if the gauge is reading correctly, if it is . It then means you have an issue with the cooling system . Which I would start by checking the thermostat., as a short stop measure you could wire in a fan cut in bridging switch.
1999 Morgan Plus 8. 3.9 ....
1961 Alvis TD21 Series1 3 Litre Auto....
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Joined: Aug 2015
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Talk Morgan Enthusiast
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Talk Morgan Enthusiast
Joined: Aug 2015
Posts: 1,616 Likes: 143 |
Following on from Smudgers post, have you changed the temperature sender? On the crossflow engined cars, the standard Ford sender is not compatible with the Smiths instruments and gives all sorts of readings!
Arwyn
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Joined: Jul 2007
Posts: 28,911 Likes: 354
Salty Sea Dog Member of the Inner Circle
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Salty Sea Dog Member of the Inner Circle
Joined: Jul 2007
Posts: 28,911 Likes: 354 |
 It's CVH engine Arwyn, but I think the same applies re: temp sender?
Graham (G4FUJ)
Sold L44FOR 4/4 Giallo Fly
'11 MINI Countryman Cooper D All4
'90 LR 90 SW
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