"55chevy210" > wrote in message news:<g_VGc.39509$%_6.4495@attbi_s01>...
> why do you add more each year?

My system leaks somewhere over the winter. This year the level was so
low that the compressor clutch would not even engage until I added 1
can. I added a 2nd can (12 oz) to get some cold air.

Maybe I installed too much---I'll check this weekend.

Thanks!