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Temp gauge occasionally rises to 75% toward the max hot area

(1990 Honda Accord)
in Mesa, AZ on October 06, 2010
recently replaced thermostat and still the temp guage reading will not typically stay in at a normal setting once running. The heater blower does not presently work. Can the heater blower not working cause the eng temp to raise above normal? What might be causing the temp to occasionanly rise now that the thermostat has been replaced?
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on October 06, 2010
Your heater blower will not cause this issue.

Does your engine cooling fan turn on? This could be a cause. Also, you could have an internal engine problem, such as a leaking head gasket which will cause the temperature of the engine to increase. Have you had any overheating recently? Any other cooling system repairs? If so, any time the engine overheats, damage could be done.

Or, you could have a sensor issue causing the gauge to read high. But I would lean towards an engine cooling fan not turning on.
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