Three problems related to air conditioner have been reported for the 2011 Hyundai Sonata. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Hyundai Sonata based on all problems reported for the 2011 Sonata.
Air conditioning drain drips onto front sub frame, which holds the engine and transmission. It also holds the suspension bolts. Dripping from air conditioning drain is causing sub frame to rust, rot out and weaken prematurely. This will cause the engine and transmission to drop out of the vehicle when the sub frame collapses.
On multiple occasions my vehicle has been serviced by a Hyundai dealership in south florida. After "repairing" the air bag signal, it has reappeared on at least four trips to the dealer. After multiple repair (including the replacement of the cables) the following issues still occur; 1) the oil indicator lights and the tachometer lights go on and off periodically, 2) the air conditioner goes off, the comes back again in few minutes, 3) the low air light comes for my tires, 4) engine light, and 5) speedometer indicator went up and down with the vehicle traveling at the same speed. The vehicle is close to 76,000 miles. The above indicated events occurred primarily while driving in city streets. However, some of them were experienced in highway traffic.
Hello, I'm not sure if this qualifies, but this vehicle has a major defect in the compressor kicking on for air conditioning (per my own experience and examining forums of other users). The a/c does not come on intermittently, especially when the car hasn't been turned on for 3 or 4 hours. This can be a major safety concern in warm areas.