Did you ever solve your problem with the ac? I recently purchased a 2003 GX with 95K miles. The AC only blows cold when the sun is behind clouds. The dealer quoted me $3495.13 to fix TSB AC003-06, which is pretty much replace the whole AC system. Ouch! I am not sure if it is worth it. I wonder if I went to a local AC mechanic he could do the same thing for much less?