Where does my coolant keep going?!?!?!

Hello I have a 91 2600i 4x4. It keeps losing coolant. I've replaced the head gasket, water pump, upper and lower rad hose, there's no wet spot under the truck. Nothing on the carpet. No white out the pipe. Any other ideas where it could be going?

How often do you have to fill it up?

Once a week

It's either leaking or burning it. Maybe try some of that leak detection dye at auto stores? Or use a coolant pressure tester? Many members suggest the small bypass hoses under the intake should be checked. It might be leaking enough not to leave a puddle or when the cooling system is pressureized? Just thoughts.

Thanks 1986b2000 stuck a gopro under my hood. Turns out the retainer on the rad cap was leaking and spraying on to my hood

"stuck a gopro under my hood. Turns out the retainer on the rad cap was leaking and spraying on to my hood "

Well, I guess that's the modern way. Typically, about 10 minutes after shutting off the engine the coolant is actually hotter, I've found some leaks in the heater hose that way on Mrs. Cusser's old Suburban.