How much antifreeze should be added to the radiator of a Chevy Astro Van?

You can't determine the amount of antifreeze needed for a Chevy Astro van's radiator without knowing the total capacity of the cooling system. This information isn't standardized across all Astro models and years due to engine size and options.

To find out how much antifreeze to add:

1. Consult your owner's manual: This is the best source. It will specify the cooling system capacity and the recommended antifreeze/coolant mixture.

2. Check the radiator and overflow tank: Look for markings on the radiator and overflow tank that indicate their capacities. Add those together for a total capacity estimate. This is less accurate than the owner's manual.

3. Drain and refill: The most accurate way is to completely drain the cooling system, then measure the amount of coolant you put back in. This is a more involved process and usually requires some mechanical aptitude.

Important Note: Never add antifreeze directly to a hot engine. Always let the engine cool completely before adding or removing coolant. Also, use the type of antifreeze recommended in your owner's manual (usually 50/50 mix of antifreeze and distilled water). Using the wrong type can damage your engine.