Hello, going thru this fox I picked up. My HVAC control for temp (hot to cold) works. Fan and all speeds work. However my blender does not work, no matter where the knob is positioned it is stuck on defrost. A/C has been deleted. The "A/C" line on the vacuum tree is plugged. I assume this has something to do with my problem. Where is this line (from A/C on tree)?