This could be a multitude of things:
Stuck closed thermostat.
Cooling fan not coming on.
Clogged radiator.
Low on coolant.
Water pump failing/leaking.
Head gasket blown, leaking exhaust into antifreeze.
Clogged catalytic converter.
Thermostat: If the Van heats up, then feel the upper radiator hose. If it's cold, then your thermostat is closed. Replace thermostat.
Coolant: If low, simply fill with distilled water and coolant. Low levels will let engine over heat.
Radiator: If there are cold-to-the-touch spots on the radiator after it should be warmed up, then a clogged is probably occuring. Have radiator flushed.
Head Gasket: If you smell exhaust fumes in your coolant reservois tank, then you got a blown head gasket.
Cat Converter: Only can be tested if off the car. Or you could try a non-contact thermometer. These are also good to testing cold spot on radiator or if thermostats are open.
Cooling fan: If mechanical it'll be spinning. If electrical, it should come on automatically with the A/C, or when it gets hot.
Water pump: Will be leaking from the front if it needs replaced. On a van, it's a tough job.
Good luck!
You'll need to change your thermostat
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