my sonata has the temp guage reaching just under halfway.the radiator was full of rusty water. i took out the thermostat that was rusty with a melted seal. usually do this with most of my cars dont really like to keep the thermo in. anyway i drained out the radiator untill clear water water come through. also the block, did it with a hose. after doing this i filled it with coolant. the next day i opened the cap and still had thick blobs of rust in the water. also i dont think the fans are working. what could be the problem?