This article in 1997 concluded
Simmons believes a solution will be found to 'sick car syndrome'.
"The automobile industry is aware of this," he said, "and they're making moves to improve the materials used to build the A/C systems, to help prevent this."
http://www.anomalous-images.com/news/news041.html
Here we are, 8 years later, and Chrysler still hasn't figured it out.
The problem is considered so bad it was even grounds for the Lemon Law.
http://www.lemonlaw.com/carsick.html