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2001 Toyota Highlander Problems
Sludge can build up in the engine because Toyota did not recommend frequent enough oil changes. Lexus will sometimes offer a discount on cleaning the engine if necessary. Owners who changed their oil every 3,000 miles did not experience these problems. This sludge build up can lead to excessive oil consumption.
Debris can get into the idle air control valve. This will restrict the air flow into the engine, causing idle speed and/or stalling when cold. The valve can be cleaned or replaced to correct this concern.
Compressor went out on Dec 31, 2009 with about 149K on the vehicle. Dealer replaced the compressor and now it has gone out again with about 164K on the vehicle almost one year later. Was not driving in unusual conditions - just started squealing like a belt or something was loose. With the cost of the part and the labor, it was about $1,000 for the first repair. Am hopeful there is a warranty when I take it in tomorrow.