Zack. The rear defroster is just a blower as you mentioned. I believe it is just connected to the rear defroster switch on the dash just like the later electric grid is. I don't think the rear defroster has anything to do with the ATC. Please quote this message in your reply. Otherwise I will be unable to reply to your message. Thanks. ----- Original Message ----- From: "Zack Morton" <zmorty74@xxxxxxx> To: "IML" <mailing-list@xxxxxxxxxxxxxxxx> Sent: Wednesday, September 08, 2004 5:33 PM Subject: IML: 2 questions about a '74 Hello all, I am wondering two things, is there any free way to find out the Date of Manufacture for my car? I've looked on the door panel, and there's nothing there. If anyone has any suggestions, anything helps! Thanks. Second, is the rear defroster, (which in 74 was a blower, not the electric one) tied into the Auto Temp, or is it a separate system, and how does it work exactly? My question is, is it possible, or worth adding one to a 74 Imperial that didn't come with one. If I did it, I would use all original parts. I'm not sure if it's worth doing or not, but I would like to, so if anyone has any suggestions or just wants to slap me and say it's too much hassle, anything works for me! Thanks! Sincerely, Zack Morton '74 LeBaron 4dr.