2003 mustang keeps going through thermostats
About every 6 months the thermostat goes bad. The temp gauge will rise almost to the red and not blow any hot air with heater on , then temp gauge will fall and hot air starts coming out. It will do this over and over till I get it home. After I change the thermostat it will work fine for about 6 months then do it all over again. I have bought the best thermostats I could buy, does anybody know what could be causing this? Also , when it starts doing this the transmission starts downshifting hard. I dont know if they are related but it seems to do it everytime the thermostat acts up.