One problem related to water pump has been reported for the 2008 Toyota Avalon. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2008 Toyota Avalon based on all problems reported for the 2008 Avalon.
Water pump while driving failed at 62,902 miles on 06/23/14, was repaired under warranty by Toyota. Check engine light came on and cut out engine while driving about 2 weeks later on lie I-495 in nyc, had to be towed to Toyota, told air wasn't bled properly after water pump repair. Again failed in may, 2016 at 86,000 miles while driving and repaired at private shop. Again failed 07/08/16 at 87,175 while driving and repaired by Toyota.