So i had to have a new heater core installed, when putting the dash back, i can not figure out where this cord went. Of course i didn't take a picture of where it went but it's only 6 inches long and i see no other connectors close to it under the steering column. Any thoughts?

 

Possibly the remote keyless entry module? Does your Blazer have RKE?

 

On my Blazer -below the glove box, by the BCM, on the interior cover that is connected below
the A/c and radio switches--- there is a plug for that for the accessory extras. They look like lighter
plugs but for accessories

 

I don't think it goes to anything. I found the same connector dangling like that when i changed the ignition switch on my 2001 4 door LT. I went crazy looking for where it went until I finally gave up. Maybe it's for some option that our trucks didn't come with? Anyway, if you do find that it does go somewhere let us know.