Does the Radian 3RXT come with a warranty? June 07, 2021 11:02 Updated Yes, 1 year from the date of purchase. If you’d like to find out more about the Diono Radian 3RXT visit our store: https://store.diono.ca/radian-3rxt/ Related articles Can my child wear a winter coat in their car seat? Can you replace Diono Radian harness straps? Quantum 2 Radian 3RXT How do I contact Customer Service? Comments 0 comments Article is closed for comments.