It could be a number of things, but firstly I’d check the oil level on the dipstick. If that isn’t rising or changing colour, inspect the inlet manifold gasket. Feel all along the manifold where it’s in contact with the head.
In my experience the inlet manifold usually leaks when the engine is cooling down.
After that have a good look at the radiator and all coolant hoses and connections, particularly T pieces. Look for any coolant stains on all of the above.
Depending on what type your head gasket is, if it’s had an MLS fitted look at where the head meets the block under the exhaust manifold at the drivers side front of the engine. It’s a common failure point for faulty MLS gaskets to externally leak coolant here. It’s easy to see if it is leaking.
Check around the water pump, this can leak but evaporate off very quickly making it hard to trace.
Don’t forget to check the coolant hose on your turbo either as this can also leak this usually leaves a pinky orange stain on the subframe directly beneath it.
Also is your expansion tank cap in good working order? It’s possible it may be allowing your coolant to evaporate when under pressure.
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