My air conditioner is not working it just blows hot air I did a compression check when attempting to put Freon in it and there is 0 compression in the line. At the same time I notice my engine fan is not turning on or my dash lights. I checked all my fuses and they all seem to be good. I was told it could be my constraint control relay module but I don't where that is located. Can you please help me it is my family car and it is very much needed!