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 Water temperature range of Instrument
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72RPR

Australia
19 Posts

Posted - 14 Apr 2019 :  08:03:53  Show Profile  Reply with Quote
My Rapier has water temperature of C - N - H Can anyone tell me what temperatures in degrees C each of these markings represent?

hillman

France
51 Posts

Posted - 14 Apr 2019 :  18:04:46  Show Profile  Reply with Quote
There is no exact match between these letters and an actual temp in C° as it also depends on the make and model but for a standard car, I mean not a racing car, you have something like C=30, N =85 to 95 and full H above 100. If the engine is equipped with an expansion bottle on the cooling circuit C could be up to 100 and H above 120.
maybe someone else might have a better answer to your question.
Hope it will help you.
What car and engine are you asking for?
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72RPR

Australia
19 Posts

Posted - 15 Apr 2019 :  06:07:52  Show Profile  Reply with Quote
Hi hillman, Thanks for your reply. This is on my 1725 Rapier Fastback. When I first got the car the temp gauge ran around the N mark. Then I changed to just an additive (Penrite Classic coolant) and de-mineralised water. This had the effect of having a very clean system and the temp now sat at halfway between C and N. I thought this was pretty good but have been told it should run hotter than indicated. I had purchased a new thermometer bulb so decided to replace the original one. Now the car ran at halfway between N and H?? Wrong thermo bulb? I have another new one which I shall install and determine if the gauge still reads over N. Then I guess I'll start on the thermostat. The car does have a "recovery" bottle in the system. Trial and error ??
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hillman

France
51 Posts

Posted - 15 Apr 2019 :  07:50:50  Show Profile  Reply with Quote
Hi
this link provides good information about the 1725 engine and a way to test the thermostat that could be yourproblem.
http://wavelen.com/wiki/lib/exe/fetch.php?media=sunbeam:wsm145_rootes_light_car_range_1725cc.pdf

have a look at it
cheers
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72RPR

Australia
19 Posts

Posted - 16 Apr 2019 :  04:12:06  Show Profile  Reply with Quote
Hi, Changed the thermometer bulb this morning, went for a drive along the motorway and, guess what? the temperature sat on the N mark for the whole trip. So it looks like that has cured the problem of faulty readings and am most happy now. Thanks for your interest.
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hillman

France
51 Posts

Posted - 16 Apr 2019 :  07:45:48  Show Profile  Reply with Quote
Good news!
problem seams to be solved.
cheers
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