my mazda millenia is overheating. fans would not turn on unless A/c was on, even then it overheats. was told it was the cooling temp sending unit or something like that. replaced it but fan does not kick on unless i unplug the sending unit. any ideas??? oh and i also talked with a parts guy ghe said it sounded like i may have air in my system thats why its not kicking on ? i have drove it to get it warm and then turned it off to check the fans i turned the key to on and nothing but like i sai d if i unplug the sending unit the fans kick on.. BUT if i drive with it unpluged and both fans are on it STILL over heats im not sure if i just need to throw her in the shop or if i can do it myself .. i had much rather do it myself thanks Mandi