daveinfrance56 Posted June 20, 2017 Share Posted June 20, 2017 Have just replaced head gasket, and a few other bits and bobs. I now have a heater dial that goes up (to top ) when I put my foot on the brake pedal. I've tried it whilst moving and stationary, same result. Is there a bright spark who could point me in the right direction or someone who has come across this before. I'm not losing water, water temp good. Quote Link to comment Share on other sites More sharing options...
Happyoldgit Posted June 20, 2017 Share Posted June 20, 2017 Vehicle? Quote Link to comment Share on other sites More sharing options...
HoSS Posted June 20, 2017 Share Posted June 20, 2017 Bad earth to the sensor? Forgotten an earth cable to the head? Possibly also the instrument voltage regualtor bad. 2 Quote Link to comment Share on other sites More sharing options...
daveinfrance56 Posted June 20, 2017 Author Share Posted June 20, 2017 It's on a discovery 300tdi 1997( sorry, new to this) Quote Link to comment Share on other sites More sharing options...
Ex Member Posted June 20, 2017 Share Posted June 20, 2017 I would guess the main harness earth is not connected or connected poorly. Quote Link to comment Share on other sites More sharing options...
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