My 1988 GTA 350 runs at 225 degrees and has dual fans. The problem is one fan works and is manually activated. What thermostat came stock and how low can I go for best performance and wear.

 

you run 225 in town or on the highway? also the stock thermo is 195, I'd put in a 180. and a jet fan switch. if you are running that hot down the highway I'm betting some plastic that pushs air inot the radiator is broken off, it was on mine when I first got the car.

 

I hooked up a manual toggle for my dual fans. Just be aware of your temp and flip the switch when needed.