One of my members starting testing every thermostat that he removed during the course of servicing by testing the used one against a new thermostat in hot water and comparing them. After testing about ten thermostats he found that every one would open 5 to 15 degrees late. Then when open, they would only open from 80 to 95%. After making these observations he started to install a new GM thermostat every time he encounter one that is over 2 years old. The owners' of the cars almost always commented that they notice that the engine was running cooler with a new thermostat.
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