Chevy dealer code reader says P0063 means radiator coolant temperature sensor is causing check engine light to come on. Fan races on high speed even when the car is just started and obviously cold. Have noticed a lot of chatter on the forum from others experiencing what appears to be the same issue. Has there been a recall? If not, why not? Car only has 43000 miles on it but that's enough to be out of warranty. Is there a simple fix?