hey how are you
1- check the oil , is milky looking is coolant mixing with oil
2- when it is running go back to tail pipe and get your hands close to the exhaust smoke coming out let it blow on your hand , do you see any evidence of coolant on your hand
3- if there is no leak in the car and you are still losing coolant and can find it that means you are evaporating thru the exhaust and have a blown head gaskette
another place you can see it will be heater core , how is your heat in the car
4- i hate to tell you but they do have a problem with head gaskette issue if the car ever got hot in it life time the heads are easy to warp,
you could have a beginning of a head gaskette and you can drive long time if you keep adding coolant to it
the only way to check 100 % is to pull the head off and inspect the gaskette and send out head to machine shop and check it for warpage
Please let me know if you need anything else on it, just reply back and we will continue
If you are good, Please Kindly Rate Me.
A 5 Star Rating is much Appreciated
If you feel I have not been helpful Please DO NOT RATE ME BAD OR POOR (1 or 2 stars) ,You can always ask me again or I can opt out of your question & open it for another expert ,that will provide you with more or better assistance on this issue
Please keep in mind that when you rate me , it does not end our conversation.
you can always come back to this conversation and ask me any follow up question you may have on this issue
(you can copy this link page & paste it in your browser when ready and it will open up our conversation again)
ASE Certified Technician