94 grand cherokee ltd. 8cyl. Not overheating but seems to be running hot. The display on the dash has shut down, heater controls not working but the defroster is blowing hot air and wont shut off. I dropped the coolant and will flush system tuesday 5-23. Have you ever heard of these problems befor?

Optional Information:
1994 Jeep grand cherokee 8

Already Tried:
emptied coolant will flush sys. may change radiator and hoses and trans coolant fitting as they are rusty. lower radiator hose slight leak, will change. do i buy a new radiator or have this one repaired?