Coolant leak only on cold night when the car is sitting

[menace1930]

Getting frustrated with this car! I've replaced both coolant flanges already. The rear flange with sensor and O-rings as well as the side flange with the thermostat. Both flanges now look bone dry and I cant tell where the leak is coming from. My next guess would be the oil cooler gasket (which is less than a year old). Anyone have any thoughts? It's like something is shrinking up on cold nights and causing the leaking.

[king_j]

How much is it leaking?
You can't see any signs of leaks?
Smell burnt coolant after driving?
Remove belly pan and park over night on a piece of cardboard.


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[vce1232000]

Psi test the coolant system and where its leaking from