Hello, I have a 2004 dodge stratus coupe. This car ahs never overheated but is losing antifreeze somewhere. I have a small overflow tank that I fill every 3 days just alittle, but if my car sits for a couple days it seems empty, although there is fluid in the radiator. i have noticed that the cooling fans do not kick on when the car reaches the temperature or even at idle? I know the fans work because I turned them on low and they roar. Im just confused? Again I am not overheating and my thermostat and the hose to the radiator have just been changed? ANY help would be greatly appreciated1 thank you

https://www.autozone.com/repairguides/Avenger-Sebring-Coupe-Stratus-Coupe-1999-2006/Thermostat/Removal-Installation/_/P-0996b43f802d6a40

Did you check to see if you have water or anti freeze in the oil? You could have a blown head gasket. This would be why you are adding fluid so quickly. let me know.

Do a Compression Test on the Engine and see if you have a Blown Head Gasket. Chances are that is what is causing the Overflow... Exhaust Pressure is getting into the Cooling system

May be a bad radiator cap allowing air through

Sorry to say but i have had plenty of experience with dodge vehicles and have ran into this problem before.....its your head gasket sucking air...(hence the bubbles in your overflow tank isnt from being hot....its the air escaping from your engine)......Plus the posiblility of your heater core being clogged....

Hello mitchellboyc and thank you for asking your question, on Fixya.

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your 2004 Dodge Stratus, without even using any tools. It has helped millions of people, and I am certain that it will help you, because I wrote it for people like you. So here is the link:
How to diagnose your overheating 2004 Dodge Stratus

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Thanks for the vote, and good luck!

Radiator cap is bad . It's flash bolling out of the radiator into the coolant reservoir ,take an have it pressure tested .

i had the same problem until i changed my water pump,so you might want to get that checked out

First the "service engine soon" light is a manufacturer installed reminder for you to get an oil change or other pre-determined maintenance service done. It is different than the "check engine" light which indicates a sensor malfunction. Secondly, when the engine is cold the thermostat is closed and the antifreeze or coolant is not circulating. The cooling system is a closed system and the tank that the cap is on is not an overflow tank but rather an expansion tank. This tank allows for the expanding coolant that is now hot to leave the engine coolant jackets, that won't expand, into a tank that can expand slightly. When your engine got to normal operating temp., aka.. hot, the thermostat opened allowing coolant to circulate and fill the expansion tank probably over flowing with the cap off. This is a normal operation for your car.

I wanted to change my thermostat too because I thought it was faulty. Come to find out my system was just vapor locked. TO fix it I just poured antifreeze directly into the radiator (not the overflow) and ran it with the cap off for a minute.