The reserve coolant tank is leaking and the low coolant light keeps coming on

are you mixing the coolant with water if yes,you need to just put straight up anti freeze ,because water evaporates at high temperatures .. also keep resorvoir full at all times there is a sensor in the tank that when is low it makes the check coolant light come on ,,....good luck

You may want to check your manual. There is usually a light to tell you the coolant level in your reserve or overflow tank is low, and there is another light to tell you the system is overheating due to not enough coolant in the entire system. Nonetheless if either light remains on and you have refilled the overflow/reserve tank it is time to look for a leak. Leaks can be at hoses, in gaskets, and other locations. A puddle on the floor where the car is usually parked can help you locate a cracked hose or loose clamp, an antifreeze smell in your exhaust can help you locate a much worse problem.Often you may detect an antifreeze smell only after the car is warmed up which can be a leak which is running onto an exhaust pipe.

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

your water pump is starting to leak from weep hole

If your coolant light turn on sometimes, and you can check that your coolant level is low, definitly you have a leak.

I suggest check this artricle about how to detecting coolant leak

Hope this help (remember rated and comment this).

is the coolant level low when it comes on, due you have to keep adding coolant to the surge tank, have you repalced the surge tank cap?

Due to the complexity of the newer cars on the raod today!! what you are experiencing is Normal!!! since the coolant systems on the newer cars run at such a higher pressure and a high Rpm the reserve tank which has it's on drain hose for excessive overflow from the radiator allows the extra high pressure release from the radiator to back flow to the reserve tank and then out the reserve tank overflow hose on to the raod

Inside the coolant reserve tank there is a sensor for coolant level.


Over time,this sensor can get stick.


Inspect the coolant reserve tank for crack or leak.

Locate the coolant level switch/sensor and soak it in clean warm water.

Make sure it's free to move up and down the float path.

Top off the coolant tank with coolant only.

Thats a common thing, Just replace the radiator and the radiator cap.

1 IT IS OVER HEATING 2. THE RESERVE IS LOW NO COOLANT OR A DEFECTIVE SENSOR I THE RESERVE TANK