. "A 180??? unit will not interfere with the ability to heat the car in winter. 180??? units can be purchased through most auto parts stores, or at any of the online 3800 V-6 vendors for around $5-10.160???F thermostats are also available, but understand that there are issues related to the engine running too cool that make the 160??? unit undesirable in most daily driving situations, especially in c" . . .