Bremquest,
First off, since this is your 1st post, Welcome to the Stovebolt!
In answer to some of your questions, I myself haven't seen a "blue" heater. Others may have more knowledge and will chime in to provide more feedback.
See the link below for a wiring diagram resource courtesy of "The Old Car Manual Project" (all credit for their work to collect and post these resources for our community to use).
http://chevy.oldcarmanualproject.com/electrical/wiring/index.htmIf you are in need of parts to support repairing/reinstalling your heater, suggest a web search using "1949 Harrison Chevy recirculating truck heater parts". You will find multiple resources that carry used (mostly ebay) and reproduction parts to help you with your task. You can also look in "The Swap Meet" forum to post a request for what you are looking for.
When you get a chance, take a few minutes and create a post in the "Welcome Centre" forum. Tell everyone a little about you, your truck, and post pictures of your truck.
We love to see pictures! If your not sure how, click on the link in the lower left page margin "Posting images in the Stovebolt Forums" and use the step by step guide.
Again, Welcome! You have found the best source available for knowledge and resources supporting our trucks.
Dan
