Blazer Blower Motor Upgrade
The heaters used in Jeeps from 78-90 Jeeps can be easily upgraded using a blower motor from an early full size Blazer. The Blazer blower motor spins faster, so you'll see an increase in air flow through the vents. Blower motors are generally so cheap new, there's no reason to get one from a junk yard. You'll need a blower motor from 73 Blazer, 350, with A/C. The factory blower motor wheel will have to be transferred over to the Blazer blower motor. Also note that you will have to slightly enlarge the hole in the firewall where the blower motor passes through.