how old are your speakers?
it's definitely not uncommon for me to see a factory radio work like a charm and then soon as you replace the radio nothing works. when no sound comes out but the radio comes on fine and everything it's usually one of your speakers is blown or grounded. factory radios just kinda work through it and have no problems (usually) but when you try to put an aftermarket in the internal amp shuts off to stop itself from gettin messed up (why it's gettin hot). all you gotta do is test your speakers with a multimeter and find out which one is grounded out or blown and then you can move from there. usually you just unhook that one speaker and then everything works perfect. its just really annoying to find that speaker sometimes lol
-- Flowmaster -- Roush grill -- Keg handle on the shifter -- kicker 750.1 on sub -- infinity perfect 12" sub -- alpine pdx 4.100 on highs -- infinity perfect component speakers -- python 990 alarm -- Goodyear Wrangler 285/70/17 for the shoes -- Hella headlights