Quote:
Originally Posted by 80stech
"Map cooling thermostat" is probably the thermostat heater as you are suspecting but if you didn't re-code the temp gauge the difference won't show up. The reason the temp gauge has the wide span at center is so that it doesn't move up and down when the thermostat heater (map cooling) is working properly. If the connection is corroded at the thermostat then likely it's leaking a bit and you should probably replace the stat as well.
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Checked where the sensor taps into the t-stat and no leaks detected... it's pretty intermittent. It does rotate a little. Unsure if that's normal.