paulob1 Posted March 25, 2019 Share Posted March 25, 2019 so we have the stop light on and after 3 or four minutes driving the overheat light comes on...the system is fully cold thermostat has not yet opened... we have a tiny leak we are having real trouble with curing...but this fault has appeared after that leak stated a long time ago...] has anyone seen anything similar of have any idea what it might be, I am assuming we have a heater sensor and wonder if that goes open circuit the stop light engages, or is the stop light caused by something else, certainty she is reaching air pressure and there seems nothing wrong on that side of things... very annoying at the moment just before her MOT... Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted March 25, 2019 Share Posted March 25, 2019 (edited) Stop light is activated by low oil pressure, low air pressure, cab lock down or high water temperature. The thermal switch (type TS 3219/9/00) is normally open and sited to the right of the gauge temperature sensor with a circular 90 degree boot. Cut in temp is 94>98 degrees, cut out 92 degrees. Edited March 25, 2019 by radiomike7 Quote Link to comment Share on other sites More sharing options...
paulob1 Posted March 26, 2019 Author Share Posted March 26, 2019 6 hours ago, radiomike7 said: Stop light is activated by low oil pressure, low air pressure, cab lock down or high water temperature. The thermal switch (type TS 3219/9/00) is normally open and sited to the right of the gauge temperature sensor with a circular 90 degree boot. Cut in temp is 94>98 degrees, cut out 92 degrees. Hi Mike. Ok we don’t seem to have any problems with air oil or the csb lock and our temp gauge is working ok but the overheat light keeps coming on after a few minutes. The engine does not overheat but and the stop light simply never goes out. Are we right in thinking it’s connected to the temp sensor if the gauge still works but it keeps telling us it’s overheating. the stop light never goes off even before the overheat light comes on. Is the thermal switch you mention activated by the temp sensor or by its own sensor. Do you know where we can get this sensor from. Is it located in the dash or on the engine. Could we have two faults. Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted March 26, 2019 Share Posted March 26, 2019 There are two devices, a temperature sensor for the gauge and the thermal switch that brings the stop light on. I suggest unplugging the thermal switch and seeing if that cures it, you will still have the gauge to keep an eye on the temperature. Quote Link to comment Share on other sites More sharing options...
paulob1 Posted March 26, 2019 Author Share Posted March 26, 2019 Mike your a star I will try that, where is the thermal switch located... Quote Link to comment Share on other sites More sharing options...
radiomike7 Posted March 26, 2019 Share Posted March 26, 2019 The drawing in the manual is not very clear but shows the two devices side by side in what might be the thermostat housing. Quote Link to comment Share on other sites More sharing options...
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