Quote:
Originally Posted by olopezm
So far there are no codes and even when the car was running without a thermostat I never got any t-stat DTC so I guess there is nothing to worry about...
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Thats because you have a 1997 model. It doesn't give off a thermostat related DTC like P0128. GM didn't program that into the PCM module until around 2001 and up models when the SII 3800 engine became Lev III emissions certified. But that doesn't mean there is nothing to worry about. The main problem with thermostats rated at 180 or 160 or having none is it takes longer to get the engine up to operating temperature and also the HVAC heater.
Also, in Mexico I don't think emissions or environmental or fuel economy is an issue(s) compared to the U.S.