What is the red wrench lite showing on dash of a 2006 Jetta diesel?
The red wrench light on the dashboard of a 2006 Jetta diesel is the indicator for the engine coolant temperature. When this light is on, it means that the engine coolant is too hot and the engine is in danger of overheating. You should stop driving immediately and allow the engine to cool down. Once the engine has cooled down, you should check the coolant level and add more if necessary. If the coolant level is full, you should have the car towed to a mechanic to have the cooling system checked.