sevasa Posted June 15, 2014 Share Posted June 15, 2014 Hoping someone can help I have a 55 plate focus. 2.0 recently my temp gauge has starting dancing. I have no issue when I first set of but once the needle sits at half way (80/100) it starts to fall down to cold, the shoot back up half way then down to cold etc. I have encloced a video on youtube of it doing so.... http://youtu.be/BAsxdp9Fte0 Is this my thermostat sticking or a broking casing maybe? I am not losing any coolant and the needle never goes into over heating. I'm lost? Quote Link to comment Share on other sites More sharing options...
jeebowhite Posted June 15, 2014 Share Posted June 15, 2014 Start with the simple, its normally an issue with the expansion tank cap that might have a light split that opens under pressure. Seen this recently on a few cars. Quote Link to comment Share on other sites More sharing options...
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