In the extreme Tucson summer, my aux fan runs with the AC after a few minutes of driving. I force it to run high speed in summer because these AC systems can't handle that heat, even with R12. If you live in a moderate climate, the aux fan probably won't come on with the AC.

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'84 190D 2.2 5MT (Red/Palomino) Current car. Love it!
'85 190D 2.2 Auto *Cali* (Blue/Blue) *sold*
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