I recently had my coolant and in cabin filter.

I recently had my coolant and in cabin filter changed. My climate control didn't work after that so we bled the line. It continued to work intermittently so we bled it again. When it comes on, it works fine, heat and cold. When you turn it on, you can hear the compressor kick in. I have read a few fixes in which it was misdiagnosed so I want to be sure I have the right fix so I don't replace something that is working fine.