This truck is loosing coolant but I have no wet spot anywhere inside, outside, or engine bay that I can find.
From time to time I can hear the heater core “Gurgle”.
I took the cap of with the engine cold and let it warm up some and the coolant seemed to go from a foam to small bubble’s to nearly nothing at all.
I looked at the oil and no coolant in the oil I can see.
No smell from the heater core.
Transmission is a standard.