Why does my coolant keep needing new coolant every other day

Are you using 1/2 coolant and 1/2 water mix in the cooling system? If straight water that could cause you to slightly over-heat. A lot of cars manufactured today run a bit hotter than they use to back in the day..... Coolant needs to be in the system but I wouldn't run straight out coolant and no water. Hope this helps. Jesus loves you, John 3:16-17 (KJV)

Probable needs a coolant temp. sensor. had this problem on 97 cherokee new coolant temp sensor fixed it. I would suggest changing the thermostat also.

You have a leak. Check the oil to see if there is water in it. Withe the engine running, check the tailpipe to see if excess water is coming out. If yes to either of these, then you have a bad head gasket or cracks in the head/block. You need to find where the coolant is leaking in order to fix it.

CTS 2003-2005 Removal Procedure...
3.2L Engines

1. Drain the cooling system.
   
2. Remove the radiator inlet hose from the coolant outlet pipe
   
3. Remove the bolt securing the oil level indicator tube, coolant outlet pipe and engine front lifting bracket from the cylinder head.
   
4. Remove the coolant outlet pipe from the thermostat housing.
   
5. Remove the O-ring seals from the coolant outlet pipe. Discard the O-rings.
   
6. Remove the intake manifold.
   
7. Remove the thermostat housing bolts (1) (image 1 attached)
   
8. Remove the thermostat housing with thermostat (2), from the engine (image 1 attached).
   
9. Remove and discard the seal ring.
   
10. Remove the thermostat from the thermostat housing (image 2 attached).

To install:

1. Install the thermostat into the thermostat housing.
   
2. Install a new seal ring.
   
3. Position the thermostat housing with thermostat, to the engine.
   
4. Install the thermostat housing bolts and tighten to 15 ft. lbs. (20 Nm).
   
5. Install the intake manifold.
   
6. Lubricate 2 new O-ring seals with coolant.
   
7. Install the new O-ring seals around the coolant outlet pipe grooves.
   
8. Insert the coolant outlet pipe (3) into the thermostat housing.
   
9. Install the bolt securing the oil level indicator tube, coolant outlet pipe and engine front lifting bracket to the cylinder head and tighten to 15 ft. lbs. (20 Nm).
   
10. Connect the radiator inlet hose to the coolant outlet pipe.
    
11. Fill the cooling system.

Image 1



Image 2

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It does sound like some of the engine cylinders are filling up with water (hydro-locking). Head gasket issues are common with these engines. The no.1 cause of it is from not using the coolant pellets suggested by mfr. Green antifreeze is too strong for the aluminum engine and slowly eats away at the gasket seals.

SOUND LIKE HEAT CORES LEAKING ANTIFREEZE INSIDE DASH.

It could be low on coolant,or air in the cooling system,or the coolant low sensor needs cleaning.

It is probably low on coolant or is air locked. Make sure the rad is full to the top and there is coolant in the overflow bucket. When you put the rad cap on, do not tighten it all the way. Just turn it on past the first stop. Run the car with the cap loose like that for a couple days and keep checking the coolant level in the rad. Keep the heater turned on as well and the cooling system should fill and force the air out. After a couple of days the rad should stay full and you can tighten the cap to it's proper position. Hope this helps.

If you have no leaks you can see, you have a internal problem.
1) Head gasket not sealing off properly
2) Cracked head and/or block
Test
Purchase Block leak tester, for your coolant system and follow instruction. If it test reveals combusting gas in coolant. You will need to pull Cly. head for further testing.

This kept happening to my 99 Grand AM and it needed a new thermostat and thermostat housing..