One problem related to cooling fan has been reported for the 2005 Toyota Sequoia. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2005 Toyota Sequoia based on all problems reported for the 2005 Sequoia.
Engine noise is very loud. It would seem that the sound insulation around the engine is missing, but it is not. The radiator fan is especially loud on initial acceleration. My first 5000 mile service was just completed and after my complaint, the dealer performed a recall on the fan which was supposed to reduce the noise. It is no better. During hot summer days, it is worse because the fan runs faster (or louder) to maintain proper engine temperature. (note: I traded in my 2002 Sequoia with 80,000 miles and never heard the engine on that car).