Hi everyone,
I'm new to this forum and I have an Evo7 in Hong Kong.

I encountered an issue that the A/C can't turn on after i used the heater for few minutes.

Allow me to explain more what i've done, I was doing coolant exchange and i turn the heater on for better coolant flow.
After the coolant changed, i turn the temperature knob back to 20degree Celsius and there are only hot air blowing out.

Any possible reason or fix can narrow down my fix?

Thanks everyone in advance