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Eighthnote, if the ambient outside temperature is +45F or more, you can be fooled that the heater/thermostat is still working....believe me though, when the outside temp is in the 30's, a stuck open thermostat will not keep up and you will know very quickly if you have a thermostat problem...I have had two previous Z3s that exhibited the same temp gage problem as you have and were fixed immediately by installing a new thermostat...
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