Temperature gauge

Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your Toyota Matrix. Based on the information provided with how the engine coolant temperature stays in the cold area at all times including when driving this can be caused by something like low antifreeze levels, the antifreeze itself froze up in the engine, the temperature sensor or temperature gauge is reading incorrectly, or in some cases even an internal computer concern among other possibilities. What I recommend from here is to have this checked into as soon as possible and to prevent driving if at all possible until it is checked into. This will help ensure no damage occurs to the engine or cooling system. I recommend that a reputable repair facility look into this concern to identify the cause if possible. If the antifreeze level is found to be low that can indicate that there is a coolant leak that needs to be located and resolved. If the antifreeze is found to be froze up that usually indicates that the strength of the antifreeze is not strong enough to withstand freezing temperatures and the antifreeze itself will need to be removed and replaced with the correct strength antifreeze. A shop will be able to let you know which is causing this concern as well as other possible causes so the correct repair can be implemented to resolve the temperature not heating up as it should. If you’d like to find a trusted, certified repair shop in your area, you can check here: https://repairpal.com/certified. If you need more advice, or have any further questions about your vehicle, we’re here to help. Just give us a call at 877-913-1554 where we will be happy to assist!