Hi there, the temperature gauge on my 2001 renault clio grande keeps fluctuating between normal and hot (the red). Sometimes the needle just stays in the red. However, the car has never overheated (even when the needle has been in the red). Also, the car has a overheat warning light on the dashboard and that has never turned on (even when the needle is in the red(. Im not sure what the problem is, could it be a faulty gauge or is it something else. I look forward to your help