The steel pipe problem is cuz you are not listening to my test.

I wanted ac report with constant low fan...but you decide to unplug for high fan...well guess what? you default ac when you default high fan.

These are specific test, so just do what the test call for.
we already know the temp dropped with high fan, we are now trying to establish ac operation w/low fan...and then I will tell you what to do

Do low fan test again and see if the ac is better and yout "STEEL PIPE" is working again

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A Dalton