To find the correct CCA, you should:
1. Check your owner's manual: This is the best source of information. It will list the recommended battery group size and often the CCA rating.
2. Look at your existing battery: The CCA rating is usually printed on the top of the battery itself.
3. Consult a parts store: Provide them with your year, make, model, and engine size. They can look up the correct battery specifications and recommend a replacement battery with the appropriate CCA.
Without this information, I can't give you a precise number. However, a battery in the range of 450-600 CCA is likely suitable for a 2001 Ford Windstar. But always verify using the methods above.