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Has the radiator been checked for rust? bet it is red with rust right now from a leaking engine cylinder head gasket, very common in this van. Remove the radiator and have it professionally cleaned and replace the thermostat and flush the engine block and put a can of head gasket sealer in the system on refill with clean new coolant mixed 50/50 with low alkaline water like drinking water from the store..
Make sure you have oil in the van. Add oil if needed. The noise is caused by lack of oil pressure as is the light. If you have sufficient oil, then you have a bad oil pump or the bearings are worn completely out. If you want to save this engine don't drive it untill it's figured out and repaired.
sounds like an intake leak or a vacuum leak , would start it and spray like carb cleaner or starting fluid on the top of the motor while it is cool not hot and see if you get a rise or fall in rpm,s if it does get a response chase down the vacuum leak, if not it is probally the intake gasket