Over the past 6 months I have been driving my car and about every 1.5 months the coolant gets just low enough to trigger the coolant buzzer on a hill. There is no visible leaks, and no signs of exhaust in the coolant.

The problem has not gotten any worse and the engine seems to be very healthy.

Any thoughts / opinions? been stumped for months on this...

 

Bad coolant seals? Anything coming out of the exhaust?

 

it could be a number of things, best way to check is a cooling system pressure test. you should be able to pump the cooling system to 15-20psi, and it should basically hold that overnight.

if it doesn't hold pressure you have a leak, the water pump and turbo banjo bolts are tricky to see on these cars.

if it does hold pressure, its possible the cap is bad, or that its running a little hot

 

are yo sure it is the coolant buzzer?
I am asking this as the low oil level buzzer is also on that circuit,so if you are on a hill the oil sensor may be triggering the buzzer.

 

Coolant light comes on with the buzzer, I also top it up after it happens and end up repeating a month and a half down the road. My car does not leak oil and I have disabled my omp.

 

fixed. i hope.