Our Canadian cousins have had a lot of problems with air-cons due to seal leaks and cracks in the lines.
Although this has occurred mostly on the 450 CDI Cars, it applies to our 451s as well. The problem is in the long line runs on our rear engine cars and the use of R-134.
I expect we will see more failures as warm weather comes. Have hope though, as there is a fix.
A2Jack