i just had change all cooling parts on these car like thermostat,radiator hose, water pump, temperature sensor. But is still the temp. gauge does'nt reach the normal range, what could it be possibly wrong? the water and oil are not mixing, no smoke coming out on exhaus but the coolant is slowly going low. And radiator fan it will only turn on when it reach middle level after that it goes back the needle onto quarter range. And it takes time to go back up in normal range cuold you help me find the solution... but i still can used my car from time to time, i just want to back in normal operation. Thank you so much and more power!!!