I pulled a heater out of an old 63 GMC truck.. It has three cables.. I did not obtain the dash mount unit.. I figure it's a three lever panel.. From what I've been told there is a recycling air heater and another one.. That means nothing to me.. I am in the process of installing the heater and I happened across a two lever panel.. I'm pretty sure the panel I happened across was for a standard heater.. Anyway, How do I know what heater I have aside from the dash panel? I have an opportunity to obtain a 3 lever panel but before I get it I need to know if I even need it.. I've seen these heater come in 2, 3 and 4 levers..
