absolutely lovely car, wanted to buy one for parents but the theft ratio of corollas are so high in islamabad so ended up buying 1.5 A/t city.
the temp guage of every car should stay in the middle regardless if its june or dec.
once the engine temp reached optimum temp it should stay in middle.
the cooling system might have air in it and might need bleeding.
or there could be another possibility. i might be wrong but this is what i pointed out after looking at your cars gorgeous meter cluster.