Go up with your own car is forbidden. To get to the summit, you will have to buy ticket to take a seat in one of the pickups that go up and down between the parking at the bottom of the mountain and the cafe (with a terrace with nice view and very reasonable prices despite the lack of competition and the exceptional setting) 3.5 kilometers higher. Hang on, it shakes a little;) Thenre you will have to take a long way of stairs to reach the temple at the top. Better to have good shoes and be in shape. Take water before starting the climbing walk because up there no one sells drinks. And if you go with young children (I do not recommend it), watch them constantly. Half an hour's walk. Once you finish wisiting, you can go back done with one of the pickups that will bring you back to the car park.
To go visit Wat Chalerm Phrakiat, you can also book one of the tours above.
Wat Chalerm Phrakiat is a temple and when you visit a temple in Thailand there are some rules to know and follow :