Just an idea, but my 93 suburban has an addition fan/squirrel cage in its rear unit. Maybe rigging up an addition fan would suit your needs.
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Marysville, WA (Dan72cst@hotmail.com)
72 4wd Blazer CST 350/350
72 4wd Chevy LWB 350/350
68 2wd Chevy LWB 327/400
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