What are the best Lexus repair shops?
RepairPal Certified shops can diagnose and repair your 2008 Lexus RX400h. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
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Possibly cabin blower fan is the culprit ... Also possibly the *radiator cooling fans* may have an imbalance issue - they also turn on when a/c is on. Good luck!