hi there all i've got a 97 escort gti 1.8 the temp sensor for the temp display is faulty it won't work i've replaced sensor several times now each time the sensor works for a few days then it starts playing up to start with the temp gauge goes all the way to the top and the battery light comes on but if you rev the engine it drops back to normal and the battery light goes out it does this for a few days then packs up alltogether again any advice appriciated