One problem related to air conditioner has been reported for the 2011 Buick Regal. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 Buick Regal based on all problems reported for the 2011 Regal.
The check/service engine light comes on. After a few days it goes away. I have had the codes read and the issue cannot be determined. Sometimes the acceleration from stop does not respond timely. It makes it difficult when merging on freeways. I was almost involved in a car accident when the first incident occurred due to slow response of acceleration. Maf has been clean. The a new maf was installed. Nothing has changed. Also I am not sure if this is related but I cannot run my air conditioner until the car has been running for a few miles. If I do the compressor will make an awful noise. An odor has started to come from the vents when the air is not running.