So today I noticed iStatPro is reporting a fan speed on 0 rpm on my MBA. After running the Apple hardware test, it returned error: error 4M0T/1/40000002-Exhaust-0. I also opened the back cover, confirming that fan hasn't been spinning. My MBA is under warranty, so this hardware failure is definitely covered. But I am debating whether to send it in, because my MBA is actually not heating up. I performed a carbon copy cloning tonight. In the 2 hours, the CPU temp max out in the 70's degree C. Likewise, I steamed youtube video over 10 min, and temp stayed below 60 C. When I am surfing/emailing, it dropped to around 50 C - all without the fan. (Some more info: I used to run coolbook, but uninstalled it during the last MBA firmware update. I also re-did the thermal paste a couple months ago, but I didn't think it made a difference back then). So, really the only "symptom" I am getting from my dead fan is a quieter MBA!! What do you guys think, should I send it in for a repair or not? My MBA is my work computer and only computer. I kinda hate not having it during the repair.