So I have a scion tc 2012 and the A/C no longer works properly. The AC blows lukewarm air (seems to just blow whatever air is outside) when I press the AC button, it doesn’t kick on the compressor. The heat works fine. I took it to a shop and they tested the pressure and said it was good. They can plug in a scan tool and make my car blow cold air but it won’t work without the scantool, the scantool can kick on the compressor. They checked all fuses and relays. They tried replacing A/C amplifier and they tried replacing (A/C switch?). Now they want to charge my $350 to fix drier and evaporater. If that’s not it they want to replace the compressor.
This is getting expensive fast, and they haven’t even actually diagnosed the problem!
Any ideas what this could be?!
EDIT: Also the radiator fans don’t seem to power on either.