I have plans to flush the system soon. The radiator is clean n fins are in good straight condition. The problem i faced just now is when car cooled down, the water wasnt sucked from reservoir bottle, upon opening the radiator cap, the coolant level was low, and i had to get it to the top. Maybe its normal? I didnt bleed the system, should i do it or it will get it self done after driving the car around for few days?