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Hmmm that sounds horrible! did it just start one day or was it after work has been carried out or another fault had occurred?My best pointer for now is that the fans and heater dont cut in till sensing (LHS of matrix) water temp greater than 50deg c but that is still a different sensor to the main engine one but there may be a link.Give us some more clues!
 

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Does it happen to oil pressure gauge as well? if so take the engine earth strap off (lower left i think ) clean it and vasaline the connecting points.Possible contacts? Roys auto electrics in shepperton (cant find his number) he sorted early db7s when the dealers could not, or a Jag xjs specialist as most is the same as late celebration models.Keep the clues coming-does it happen if you switch on other high load items,heated screen perhaps?
 

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electrical problem

Hi Pete,hmmm I am confused that the oil pressure is not affected but still think the first stage is to look at the engine earth,I have 2 db7s at home at the moment I will check them at the w/e and let you know location etc.Also I will try to see Roy the autoelectrician and pick his brains!
 

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electrical problem

I spoke to Roy,He reckoned look for voltage stabiliser-I could not find one on the wiring diagram(that does not mean there is not one!).The temp sensor however has feed and return unlike older cars which used the engine earth as return.So I would suggest buying a Jag equiv temp sender ,which should not be more than £6 and plug it in,no need to install it into the block as a trial.If it doesnt make any difference you have lost £6,If it reads ok get the correct part from AM fit it in the block,happy days
 
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