Hello;
Although you cannor see any visible leak dripping on the fround, your coolant is going somewhere, so obviously there is some sort of leak present.
there are lots of possibilities as to where the coolant is going. It could be a water pump that is leaking under specific conditions (such as when the engine is running only). It could be an intake manifold gasket, or a cylinder head gasket. You could have a small radiator leak, a leaking coolant hose somewhere, or possibly a heater core leaking (although this would usually result in an oily film on the inside of your windows or visible coolant running out from under the dash).
The easiest way to locate the source of the coolant leakage is to take the vehicle in to a repair shop to have the cooling system pressure tested. To do this, a technician will attach a device like a bicycle air pump to the filler neck and pump air into the system to put it under pressure. This usually makes even small leaks show up. If the leak is too small to show quickly on a pressure test, the next most common method is to add a small amount of dye that glows under UV light to the cooling system, and run the vehicle for a few minutes. Inspecting the engine with a high intensity UV light then makes liquid coolant glow bright yellow, making it easy to spot. This type of testing is usually pretty fast and easy, and therefore inexpensive to have done (well under $50 for both tests if both are needed in most areas). You don't want to wait too long before having the leakage diagnosed; modern aluminum engines can sustein severe damage if they accidentallly overheat due to a low coolant level.
I hope this is helpful; if so, an accept would be most appreciated! Thanks!
