In article <"067063B02AF2603E*/c=us/admd= /prmd=Cat/o=NOTES/s=Gosling/g
=Richard/i=B/"@MHS>, Richard B Gosling <Gosling_Richard_B@perkins.com>
writes
>
>Mike wrote -
>
>"I must admit that I'm bemused about the efficiency of the cooling system
>on Carly. On Saturday, when it was over 80 in the shade, the needle on
>the temperature gauge went just past the middle. When the weather is
>cooler, and I'm on an open road, it rarely gets above a quarter of the
>way up. I'm not complaining, but it would be nice to know why Carly
>seems so much more efficient than many of her stable-mates."
>
>My first reaction is that your thermostat may be opening at too low a
> temperature - either faulty, or your DPO chose to fit a low-temperature 'stat.
This sounds very plausible. The DPO was a fair-weather driver, and I
would not be at all surprised to find that he was more concerned with
cooling the engine in Summer than keeping it at a nice mid-point in the
snow.
>You could always replace it to see what happens - they are not expensive (and
> you can get them at Halfords, no need for a trip into the Fens!).
I may do this, come the autumn. I find the idea of having a winter
thermostat and a summer thermostat appealing!
>
>The only other possibility that occurs is that the reading is wrong - dodgy
> gauge, dodgy temperature sensor, or dodgy voltage regulator (although dodgy
> regulators will almost always give a high reading, not a low one). Again, the
> only way to check that I can think of is to replace a component and see what
> happens. I wonder if TRGB would let you take a handful of those old temp
> gauges and try a selection to see what happens... Hmm, not sure about that!
> Could even be a poor connection between the gauge and the sensor - the sensor
> works by increasing electrical resistance as the temperature falls, so if you
> introduce some extra resistance via a poor connection the engine would appear
> to be cold. Try cleaning up the connections nicely at the gauge and the
> sensor.
I am fairly sure that the reading is (now) right, since I cleaned up the
connectors. If I leave the engine running whilst she is parked, she
comes up to the mid-point and stays there (as she should), whatever the
weather. The additional cooling from the wind rushing past the
radiator seems to be what keeps the temperature low when she is being
driven.
>
>Cold engines are a little less efficient that correctly-temperatured ones, but
> at least it gives you a nice feeling of security!
Quite. I'm driving for fun, and not for fuel efficiency, and I'm still
getting 35mpg, so I don't have too many concerns about this.
ATB
--
Mike (and Carly)
Michael Hargreave Mawson, author of "Eyewitness in the Crimea"
http://www.greenhillbooks.com/booksheets/eyewitness_in_the_crimea.html
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