My new dodge is giveing me a bit of a prob i have a 03 1500 was driveing along and my speedO stoped working my abs light and my brake light came on and my a/c will not blow cold all at the same time i took it to auto zone and they said its the speed sensor but what i dont get is why would that have anything to do with the a/c the fan blows but when i push the lil snowflake light no a thing happens any sugjestions/ideas

 

The speed sensor kinda makes sence for the speedometer.....but not the abs and esepcially not the ac. It sounds like something electrical...but there so hard to track down. Does it drive and shift ok?