03 civic ac issue
hi guys im new to the forum and saw this thread while browsing to try and fix my a/c. I have the same problem in a 2003 honda civic lx. i have completed most of the test but not all cuz some connectors and wiring is different colors. What i can tell you is all fuses and relay work. Relays were bench tested and swapped. Low pressure side has about 35-40 pounds. High side i am unsure of. The a/c does not come on and does not cycle when the button and fan are selected. The a/c can be forced on by if the blue/white wire are jumped to the red wire on the thermal protector connector, compressor will lock up if just the blue/red wire is jumped. Jumping 2 and 1 in the fuse box will turn each on individually. Here is where it gets odd when the blue/white and red wire are jumped on thermal protector the a/c fan and rad fan both are stuck on as well as the compressor, a/c seems to still blow outside air, low side tube gets cold, but high side tube remain close to its original temp, hard to tell if a/c is actually producing cold air since its about 55 degrees where i am right now. Back to the funny part with the two wires jumped the fans run and a/c compressor locks up but inside the car the fan is selected to high and the blower motor works at all items, if i select the a/c button it lights up green and turns off the compressor and both fans outside. So with the wires jumped the a/c switch works in reverse. An added note that may help here is the relay terminal in fuse box all appears to be good 1 thorugh 3 on both compressor and clutch now four gets tricky on number four on compressor relay (relay that is closest to windshield) there is no power 0v, i figured it was a ground and trying to read battery voltage using terminal four as my ground still 0v so i check continuity from terminal four to battery ground no continuity and no continuity from terminal four to battery voltage, i can get continuity from all the other by connection to its opposite post based on if it reads voltage or not. My question is where does terminal four go to and what is it supposed to be. Also what color wire is it on the bottom in which connector? Unless of course someone can just tell me my problem from this.
Added note jumping the pressure switch has no affect and the actual pressure switch has continuity.