Well then it sounds like everything is working as it should. Guess the 85s have an overheat sensor like the later cars. The pusher fan should never come on if the belt driven fan is working properly. I would look into that.

What did the dash gauge read when the fan came on?

-Jason

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.