Is anyone having their temperature gauge take up to 20 minutes to reach a needle below half and then see the needle go down to a quarter or less after the car has reached operating temperature? This has happened on days that are 26F and colder. I noticed it three times so far. Also takes longer to get heat. This problem is also occurring with 2017 and 2018 Elantras. See this topic under the Elantra latest generation. There are 3 TSB's for a fix of the affected Elantras.