I have a 1995 Chevy G20 Van with a loose wire set (white, yellow, and blue wires into a GM connector) coming from the firewall near the fuse box through a grommet into the engine compartment. Any idea what this may be for?

 

A picture saves a thousand words.

 

Good idea. Here are a couple of pictures.
Thanks!

 

dont know. does the car run fine? I would speculate probably engine block heater connection?