If My Car is overheating and i turned the heater on the temperature remains stable what could be the problem?

I have 1998 honda civic it was good a while back then no long Ago it started overheating and i change the thermostat and nothing changed and then they told Me the catilyzer could be clogged and i fixed it And nothing changed the rare thing about this is that when the temperature valve start going up i turn the heater on and it goes back down to halfways. I've taking it to a mechanic and he couldnt fix it… I need help.If My Car is overheating and i turned the heater on the temperature remains stable what could be the problem

You need to either have a radiator shop rod out (clean the tubes) the radiator core or replace radiator. The radiator isn't able to do all the cooling engine needs and turning on heater adds a little more cooling. The radiator probably hasn't been inspected internally in 16 years, and you've described classic symptoms.

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