where on the web can I find a diagram showing the radiator hose routing on a chrysler minivan?
on the passenger side, on the upper part of the radiator there is a large hose and a smaller one, the smaller one is missing. Where does it go to? It's probably still in the engine compartment somewhere but I can't find it
that sounds like your bypass hose... it goes from just below the upper radiator hose behide the bracket directly under it to a metal tube which is attatched to the side of the engine block . To help you more I will need to know the year model and engine
How to 
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When a radiator hose is leaking, it needs to be replaced. Most new vehicles have formed hoses, which means that a hose specific to that particular vehicle must be obtained. This is not difficult, as most auto parts stores carry a wide selection of hoses, along with hose clamps and coolant, which are also advisable to replace at this time.
Likewise, check hoses for leaks and cracks or loose clamps; give them a squeeze and replace those that are brittle or feel spongy. • Inspect the tires for uneven and excessive treadwear and make sure they're inflated according to the manufacturer's