Would a bad thermostat cause the low coolant light to stay on? Mine is always on, but the coolant looks like its pretty full in the resevoir tank..its real brown though lol, ill be changing that soon. anyways my car seems to run fairly cold, like on the gage its right between 70 (very bottom) and 100 (middle) so like right at 1/4. To me thats cold, every car ive driven usually goes right to the middle and stays there. So could the t-stat be the culprit of the low coolant light?