jbl and ac problems

[supacpe]

I have an 89 with the factory jbl system that works perfectly untill the the temp outside drops below 50 degrees, if it was a cool night the system will turn on but untill the temp rises there is no sound. I thought the amp amd subwoofer might be defective so I replaced them but no change. any ideas? Second the ac blows icecubes sometimes for hours at a time and sometimes for maybe 20 minutes both before and after I upgraded to r34. any suggestions thanks

[35th T-bird SC]

Welcome, I think the head unit gave the most problems on the JBL sound, trying swapping that with a newer Mustang head unit. On the A/C I would take a guess at the WOT cutout relay may be sticking.