The Tiger had two large radiators for engine cooling. Each radiator had an inlet connection at its top and an outlet at its bottom.
This is taken from a German diagram. We are looking forwards through the engine compartment; the engine is not drawn, but the pipes for cooling water are drawn and I have shaded them.
At top right, the red pipe takes hot water from both sides of the engine and delivers it into the top of a radiator (which is beyond the edge of this sketch). The water, now cooler, comes out of the bottom of that radiator, and a long pipe takes it over behind the engine to the top of the second radiator. Finally, the water comes out of that (the blue pipe) and goes to the engine.
Trumpeter have not given us that system in their Tiger model. This is a photo of the assembled model. It is missing the long pipe that links the radiators, and it also lacks a short pipe that gathers water from both sides of the engine.
Trumpeter connected the two sides of the engine, separately, to the inlets of the two radiators. They didn't connect anything at all to the radiator outlets. The model is radically different to the real Tiger.
It is noteworthy that Rye Field provide the correct piping in their 1/35 Late Tiger kit.