The alarm not shutting off could have been a switch to ground circuit . Perhaps the alarm circuit ground was constant. If I am following this topic correctly, then I am curious because it has been determined your A/C clutch is grounding when it should not. A splice from an aftermarket devise to a ground is fairly common. Also , your fuse box , As heat increases , resistance increases. This is not diagnostic directions. I believe your eventual fix will involve correction of a ground. Keep after it and know when to walk away till next day.

 

Thanks for the advice Old Honda Dude. I have learned the hard way to quit a project when I get to the breaking point. But sometimes my stubbornness wins and I end up overdoing it. I pm'd TexasHonda.

 

I am 100% sure that the a/c compressor should not turn on when the cooling fans turn on to cool the coolant due to temp switch A turning on.

 

PA, just thought of a question. Is the only time the ac clutch suppose to spin when you manually turn on the ac switch from inside the car? Or is there any other time or reason for the clutch to engage?

 

It might be that selecting the "defrost" position for air direction will switch the AC on??

Somewhere back in this conversation it was suggested that you set your ventilation blower to zero or off. That's supposed to prevent the AC from switching itself on.

 

When the issue happens everything is completely off, no defrost, fan set to 0/OFF, basically nothing running other than the car itself. Thats a good point about the defrost though, I know its like that in my mother in laws 2004. Defrost automatically turns on the a/c to assist.

 

I used to have a 1998 and defrost will turn on the AC. When it did, the green light on the AC switch would light up indicating the AC was on. You could then switch the AC off.

Then we had a 2003 and the defrost also turned on the AC. But it did that in stealth mode, where the green light would not light up. And you could NOT switch it off.

I'd assume your 95 behaves like the 1998 did.

 

Jim, I think that feature started in 1998. My a/c would never turn on automatically to help in defrost mode on my 95.

 

Got your PM. Here's what I suspected earlier:

Compressor engages because it get's a ground signal to the AC compressor relay. Why? The ECU thinks the AC is commanded On. You have to find the false ground that is causing that signal.

From what you've posted, the AC Switch (dash panel switch) has been disconnected, and still the AC compressor engages. That means there is a ground somewhere on the Red/Wht wire possibly near where red/wht ties to ECU input. I believe the tie-pt between red/wht wire to ECU and diode must be near the diode under the hood. Note, this wire would run all the way back to the ECU under the passenger's foot area, so there are many places where an accidental or deliberate short could be introduced.

I'm not absolutely sure of above, because much earlier you posted that Red/Wht had 12V, which is what it should have if NO ground is available. Only when ground occurs through normal path (AC thermostat, panel switch, and blower fan switch (On) should ground pull the red/wht to ground and send signal to the ECU to command compressor.

I assume you have the wiring diagram to check and be sure you understand.

Another possibility is a sticking AC compressor relay. Once closed the contacts weld closed and compressor will always run when keyswitch is ON. Verify that AC relay opens when keyswitch is turned to OFF.

good luck

 

On an auto, doesn't the red/blu wire run to/thru the tcu.