Hi,
You can remove both. It will allow air to enter the system faster and drain things faster as well.
First, here is a link you may find helpful. It explains, in general, the procedure for draining and flushing the system.
https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars
If you look at the attachments below, they include the directions specific to this vehicle for draining, refilling, and bleeding the system.
I hope this helps. Let me know if you have other questions.
Take care,
Joe
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Saturday, May 15th, 2021 AT 11:13 PM