What causes the temp gauge to go up to hot?
What causes the temp gauge to go up to hot? Temp sender unit is faulty: Remove the sender unit wire and earth it against the bodywork and the gauge should go straight up to hot. This indicates that the gauge and wiring is fine and that the sender unit is faulty. Highly active question. Earn 10 reputation in order to answer this question. Is it normal for the temp gauge to go past half way? Diesels do run slightly colder, but around half is fairly standard on every car I've owned. The gauge doesn't have useful information, that's why a...