temperature gauge reading lower than normal
recently I found that the temperature gauge needle reading was much slower than before to reach the centre.
Usually it will take about 10 minutes or so to reach the normal, but now even I drive it for about half an hour, the needle is still below, I tried to use a OBDII reader to get the real temperature, but could not find it.
1 month ago, a plastic tube on top of the rad was broken, and I replaced one now it works like this.
what can be the real problem?