Astro van overheating

Do yourself a favor, Radiator is blocked, or motor itself. Flush radiator, and blow air throw motor if possible, or get Engine water cleaner. Let me know, good luck.

the gasket might be flat and try to check if the fans blows well and check the radiator is not leaking.

If an engine is overheating at idle and low speed the fan clutch is not working or have a bad leak in the head gasket or a clogged radiator. If it is overheating at 60mph clogged radiator or head gasket. Check your antifreeze for fuel gases . you can buy a liquid to put into the radiator if there are fuel gases the antifreeze will change color. head gasket is bad.

I have also had bad heater cores that were clogged evapo rust is the best stuff to get unclogs everything and removes all your rust Safeway especially on gaskets and aluminum

Also you want to remove all coolant from the system adding evapo-rust and water you want to get this out at boiling temperature if possible driven for 1 week then drain and add coolant. Once complete your parts will function properly well remove all rust Plus remove clogs Plus renew's thermostat functionality and looks