Can anyone explain why on a cold day when the temp. falls below freezing, that the Add Coolant alert comes on for about 5-7 minutes, then turns off when the car is warm.



When the temp. is above freezing, maybe around 40 degree plus, this does not occur or if it does, it only beeps for about a minute.



The radiator has enough anti-freeze and water mixture and according to the stock temp. gauge, it is not overheating or even close to running hot.



Can someone please advise.



thanks.

 

Make sure you have coolant in your overflow and no air in the system. The coolant expands when it gets hot and in warm weather. The buzzer is fussy, but better safe than sorry.