Has the blower motor been replaced? My experience is that the secondary market blowers do not work nearly as well as the OEM blower. I hope there is one out there that does work but I have not found it yet after three tries. For me, A/C and Defrost do not have the output needed to do the job. Using a relay is about the only alternative since max output with the newer motors is the equivalent of medium on the OEM blower.
Craig


2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado