Question about 1998 Jaguar XK8

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Coolent light stays on but not overheating

Coolent level good but warning light stays on

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Inside the top up tank there is a little float, I usually locate it and just work it up and down with a screwdriver, lots of times as the float can get stuck, failing this check the little sender unit under the said tank, but I must stress KEEP AN EYE ON TEMP GUAGE. This is a proper pain as I experience this often but used to it now, once a week when checking water level I just put screwdriver in and bounce the little float. hope this helps

Posted on May 13, 2014


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My car over heats, but i get no warning lights on my dash. i have coolent and oil, but i still over heat.


If there are no dashboard/warning indicators in an overheating situation, then the coolant thermal sensor is faulty and needs replacement.

A few things you can try to reduce overheating:
  • remove altogether the thermostat (not applicable in cold weather);
  • hotwire the radiator fan to be always on when engine is running;
  • check the: radiator hoses, radiator, water pump.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

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