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The Aux fan is not essential to maintaining the correct engine temperature. Mine doesn't work. I've been thru four Phoenix summers without it and while the temp does rise slightly in midsummer sitting at a light the needle never leaves the 80 in the temperature gauge. So if you are worried about overheating because of the aux fan I'd say forget it. The main fan on the car though if I understand you correctly is missing a blade? That I would definitely replace, after sorting the vacuum issues and the fuel return lines. Engine mounts too probably.
- Peter.
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2021 Chevrolet Spark
Formerly...
2000 GMC Sonoma
1981 240D 4spd stick. 347000 miles. Deceased Feb 14 2021 
2002 Kia Rio. Worst crap on four wheels
1981 240D 4spd stick. 389000 miles.
1984 123 200
1979 116 280S
1972 Cadillac Sedan DeVille
1971 108 280S
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