The first pi
The first pic is the fill hole for the coolant. You remove the bolt to bleed the system. I have a 98 which is slightly different but here's a video to get you started. I would flush the whole system if it were my car. The coolant seems to have a leak and is crusty. The coolant probably has NEVER been changed. I would also refill with Toyota red coolant or the equivalent you can find at advance auto which is Zerex Asian.
https://www.youtube.com/watch?v=dGGwyjv36OU
The second pic is the heater valve which control the heat in the car. The 2 hoses are supposed to be connected to the valve which opens and closes when you change the heat settings.