Take off hoses, open the radiator where the thermostate is located. Add water to the radiator and allow the system to circulate. Do this while the vehicle is running.
Bleeding the brake system after changing the brakes can be hard on some anti-lock braking systems. The good news is that on some GM vehicles,scan tool isn't needed to bleed ABS brakes. A scan tool is only needed with a DBC-7 anti-lock braking system,then only if air entered the ABS modulator during brake service.