Gonna be replaceing my Thermostat for my '86 Sport. Parts store lists two thermostat's, one that's 182 degrees, the other that's 192. I belive I remember reading S4's thermostat's opened at 190, which would mean I'd need the 192, but I'm not 100% sure I'm right either. Any info would be great.

 

182, all the stock stats were switched to this round the time the 3rd gen came out. Also, general forum wisdom is that anything besides the mazda stat could cost you a motor..

 

As per the 88 and 89 FSM's, the stock FC thermostat starts to open at 180degF.

 

play it safe and buy the thermostat from a mazda dealership.

 

only use a Mazda thermostat in the car... DO NOT USE A STANT