XJ6 & XJ12 Series I, II & III 1968-1992

Coolant Temperature Sensor 1977 XJC 4.2

 
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Old 02-02-2019, 10:56 AM
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Question Coolant Temperature Sensor 1977 XJC 4.2

When the engine is up to operating temperature (assumed!) the temperature gauge continuously reads half way between zero and the N on "normal". This is the case, even after a long run.

I have blanked the radiator with some cardboard to see if I can bring the temperature up, but nothing changes. The heater blows warm air so the engine is warming up, but to what extent I can't tell.. I want to start by replacing the coolant temperature sensor and, if that doesn't work, address the gauge itself and finally the thermostat.

Can someone tell me where the sensor is on the series 2 4.2? I can't find any reference to it anywhere. If anyone else has experienced a similar issue, I'd be interested to know.
 
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Old 02-04-2019, 08:20 AM
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I've completely revamped by 4.2 XJC S2 with two electric fans (eliminating the viscious fan) and installed and temp sensor in the upper radiator hose. So I can't answer your direct question. But what I will say is the you might want to invest in a small money digital temperature laser gun from HF. That way you'll really know what the correct temps are anywhere on the engine. Also great for shooting frying pans to see when they are ready for eggs. Want to try something really cool with the temp gun - shoot the sky and then the clouds - REALLY A EYE OPENER the temperature difference. I also use my for A/C air in versus air out. You'll find all kinds of uses for it.
 
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Old 02-04-2019, 10:40 AM
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Thanks
!!!! I have one. going to play a bit more
Carl
 
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Old 02-05-2019, 08:40 AM
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My experience after being a Yacht Broker and being on over 600 surveys in the past 17 years is that analog gauges are notoriously wrong. And that digital gauges (or at least Surveyors digital gauges) are MUCH more accurate.
 
 
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