When i turn on my blower motor after a few seconds it clicks and shuts off. Plus the air stays down on the floor when i put on defrost. I replaced the heater core so wonder if i hooked something up wrong. Any help appreciated! 
OK,…I’ll ask the obvious question; Did it work properly before you changed the heater core??? Oh, does your ride have functional stock A/C?
I turned the fan on and it stayed on before but it never had a heater core in it since the previous owner took it out
You mean this one?
