OK. It's possible that I may need to replace the dual pressure (hi and low in one switch) a/c pressure switch on my 2009 Fit (I'll be doing the diagnostic testing routine in a day or so found in the service manual). The pressure switch protects the compressor from too low and too high system pressures.

So here's the question: Do you have to evacuate the system first? Or does this a/c system have a valve that prevents evacuation into the atmosphere when the pressure switch is removed?

Anyone, anyone?