A/C Comes On By Itself

[Brentster]

As the title says, I will be driving and the A/C comes on, is this a problem with the PCM. Any help is much appreciated. My Marauder is a 2004 with 77,000 miles on it.

[Mr. Man]

Assuming you have the climate control system in the OFF position when this happens this a a new one to me. Waiting for possible answers will be intriguing.

[Brentster]

Assuming you have the climate control system in the OFF position when this happens this a a new one to me. Waiting for possible answers will be intriguing.

Every time this happens I hit the off button, went out tonite and it came on 3 times.

[ChiTownMaraud3r]

Sounds like a bad EATC unit to me... but I'm not sure.

[Turbov6Bryan]

No print here

I would assume eatc to relay. Where's this relay boys?

[RF Overlord]

The A/C clutch field coil relay is in the BJB.

[fastblackmerc]

As the title says, I will be driving and the A/C comes on, is this a problem with the PCM. Any help is much appreciated. My Marauder is a 2004 with 77,000 miles on it.

What do you mean by the "A/C comes on"?

Does it come out the vents?

Is the EATC set to "AUTO"?

Does the A/C compressor clutch come on?

If it comes out the vents, does it happen with the EATC off?

Just trying to get a better understanding of what is happening.

[Smokey Bones]

Brentster, this was one of the symptoms that I had. I replaced the blower control module yesterday and now the gremlins are gone. It cost me 42 bucks at advanced auto. Let me know what comes of yours.

[tbore007]

Mine does the same thing. I think it may be a faulty fan switch on the side.