Auxillary fan installed in front

[dr. d]

I remember '90s cars had fans in front... Another behind the radiator...

Fan in front is connected to the A/C compressor...
Radiator fan is linked with the thermostat...

I think '90s Sentras have 2 big fans behind the radiator... Instead of the front and back set-up...

many rear-drive cars of 90s and older, had fans behind the radiator. but to some owners, the aircons and engines got hotter in heavy traffic.
they added auxiliary electric fans in front of the radiator. the set-up resulted in cooler aircon and engine, and did not result in engine overheat when off.
i had one, myself.

my '97 sentra had two aux fans in front. and they gave me a big headache.
for a long time, i could not find the source of my engine's tendency to overheat in traffic. until an oldtimer mechanic showed me just how weak my old fans' airflow was, compared to the new ones'. we had to do it side by side, as my old fans still managed to push out considerable oomph.
strangely, the aircon was still acceptably cold. but it did get factory-arctic-cold, after replacement of the old aux fans.