It sounds like it may be stuck open and it will throw a code if it wount get up to operating temp,for the price id run out and spend the money and buy a new Stant SuperStat thermostat.Here are some easy to follow directions for replacing the T-Stat
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Stant SuperStat® premium thermostats use a patented v-notch, non-linear design valve to stabilize engine temperatures and allow the engine to warm up faster. This feature reduces overcooling when the thermostat opens, and overheating when the thermostat quickly closes with the rush of cold coolant, thus reducing thermostat cycling. The advantages of a quicker warmup are prolonged engine life and improved fuel economy and emissions. The heavy gauge stainless steel construction and spring offer longer life and maximum performance.
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~Larry~