One problem related to radiator has been reported for the 2006 Toyota 4Runner. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota 4Runner based on all problems reported for the 2006 4Runner.
When at stopped at a street light or just stop in gear with the brake applied, car will jump forward to a point were I may hit a car in front of me. Second, radiator fan hits the shroud. Caused by broken weld at the motor mounts. Which can cause a fire. Dealer ship in riverside was contacted and they can't do anything about it.