Honda civic 01 is overheating?

It has coolant/freezon. At first itll start over heating when I turn the a/c on now after 30 mins of driving it'll start to overheat. What can it be.

Thermostat is sticking or the radiator is clogged.

First of all the AC has nothing to do with it overheating! Start by changing the thermostat and then flush out the cooling sysyem, especially the radiator! Also make sure the radiator fan is kicking on!

I told you yesterday…

Is your condenser fan coming on with the AC? If not, there's the reason. If it is, either you have air blockage at the radiator/condenser, or a failing expansion valve, compressor or blockage in the AC system causing pressures too be too high.

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