Chrysler Repair: Thermostat for a 1992 Dodge Spirit 3.0L V6-Automatic, water pump impeller, degree thermostat

Question
Hello Roland, thank-you for getting right back to me. Would you please explain to me in a little more detail what you mean by your last sentence, are you saying that I might have other problems that I don't know about? I just purchased this car, but the person I purchased it from(the first owner) seemed like a very honest person. Thanks Again. Tom-------------------------
Followup To
Question -
Hello, I think my thermostat is beginning to stick a little and I would like to replace it, please correct me if I am wrong but I think it calls for a 180 degree thermostat? Is this what temp thermostat you would put in it or should I go with a higher temp thermostat and if so what would be the benefits? I don't know if it matters but I reside in Pennsylvania where the winters can get pretty cold. Thanks for your help.
         Tom
Answer -
Hello Tom,
I believe that the engines are designed for thermostats that open in the range of 195 degrees rather than 180. You will get better heater performance, and better fuel economy if you run the 195 as designed (actual design minimum is 192-199). The lower temp thermostat is a short-cut, sometimes, around an inadequate cooling situation that causes problems when the ambient temperature is high.
Roland  

Answer
Hi Tom,
I can't infer the reasoning behind the former owner having a 180 thermostat, but that is usually the motive, although some people just want to have a margin of safety for those sweltering days in summer when the gauge tends to run a little high. I wouldn't worry about it, just save the 180 for possible use in the summertime. But in theory if the radiator is clean, the system holds pressure, the water pump impeller is effective in circulating the coolant, then the system should handle the summer heat with the 195 thermostat still in place. And you will have good heat this winter and a better running engine. If the engine doesn't get up to its design temp the moisture that condenses in the oil pan doesn't get driven off as quickly and the oil can be thus less effective at internal lubrication of the engine. So everything points toward using the 195.
Roland