I think for what it is, its a heck of a lot of hassle. SRi's have air con, dunno about other models though..
Ive never got my head round this air con business. To me, normal heaters are almost as good and you can always wind your windows down if its too hot like.
ive never been in a situation in my car where i thought "man, i wish i had air con".
I suppose if youre stuck in traffic on a really hot day it would be useful...
To be fair though, i know nowt about air con, so just ignore me! sorry for the useless rambling..