Yea, check the squirl cage on the fan. Mine was cracked and broken. It looked like the mice were chewing on it. Also i had leaves in the heater box that were obstructing the flow and cracked and broken defroster ducts. I got good heat now. It will make your feet sweat! Also put anti-seize on your wire going into the control cable so you dont break off those heater control leavers. They always break off.
Randy 
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72 k/10 short wideside
72 k/5 Blazer
72 K/5 Blazer - obstacle course racer
72 custom/10 8' bed
70 K/5 Blazer
67 C-30 GMC Flat bed
86 GMC K2500 Plow Truck
85 GMC K3500
84 M1008
85 M1008
77 G30 Motor Home
72 Sears 12hp Tractor
Glenmoore, Pennsylvania
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