Hello, y'all,
This is my first-ever post on NAM! I have a 2006 MCS. I bought the car at the end of last summer with no A/C. It didn't bother me because the temperature was dropping. Currently (already liked this since I bought it), when I push the A/C button, the light doesn't illuminate at all, and A/C does not kick in. No blinking or anything else, just darkness.
I searched up and found a post about a similar issue: https://www.northamericanmotoring.co...ml#post4642191 but it didn't have a solution.
Compared to the post, instead of an electric IHKA panel, mine has a 3-**** version (see the below picture). Also, my rear window defrost works.

So I ran it with the scanner, and this is the code: 0000C8.

What does BC1 mean? (also, if you guys have any ideas with other codes, please don't hesitate to talk about them!)
I also found a video from modmini about replacing the AC clutch coil: Could replacing AC clutch coil help with this situation?
Any ideas would be appreciated!

 

BC1: Body control module 1
C8: GM: A/C compressor: not response to BC1. (Basic module control unit)

The code suggests the problem might be (might be) with the A/C clutch. Assuming the A/C clutch non operational when the BC1 commands the A/C compressor to compress it doesn't respond.

But if I were you before I went to trouble/expense replacing the A/C clutch coil I'd want a higher confidence diagnosis the coil was the problem.

One way to get this might be to with a helper monitor the voltage at the A/C compressor connector the pin that receives the signal from the BC1 to turn on/activate the compressor to see if the right amount of voltage appears when the A/C compressor is activated from behind the steering wheel by the helper. Of course you'll need a wiring diagram. Techs also have handy various test connectors that allow them to probe electrical pins/sockets.

A visual check of the A/C compressor and especially the clutch might have you seeing signs that the clutch is at fault. Excessive play. Dust. If you are careful and with the engine running maybe even a feeble bit of movement of the clutch when activated.

About all I can offer. A tech would undoubtedly have more sophisticated diagnostics to use to clearly ID the source of the non working A/C compressor.

 

Dont overthink it. The system probably has a gas leak. The compressor will self protect in the absence of sufficient gas. No light, no compressor no nuth'n. A Walmart or AutoZone DIY refill kit is all you need to at least prove it without going to a A/C shop. If a some gas kicks it on then you know you have a leak and can schedule accordingly.

 

You will be able to determine if the A/C clutch works by simply looking at the compressor pulley when someone else turns it on. If the A/C clutch is not working the center of the pulley will not spin. If the center spins, the clutch is not the problem. Rebuilt compressors are relatively inexpensive on eBay. That's where I sourced mine and it's worked perfectly for three years now. If your clutch appears to be working then you'll need to have your freon/pressure checked. You might call O'Reilly's or AutoZone to see if they offer a free check. Replacing the compressor is not a hard job but if you're not mechanically inclined and/or have the right tools it can be an expensive repair.

 

The clutch will not engage if the system is low on gas.

 

The fan must be on at least '1' & some R134A must be in the A/C system.
I suggest a $15 recharge kit with a gauge from an auto parts store. If it's completely empty, 2 cans should get it going.

 

You can test the clutch coil for an open circuit by popping the relay out and checking the proper terminals with an ohm meter. I don’t remember the terminals off the top of my head, but a wiring diagram will sort it out. If you have access to a set of manifold gauges, you can check the high and low side refrigerant pressures.

 

Thank you for your great suggestions!
I think the best route for me to start is to recharge the A/C system and try it again and inspect the clutch etc.
I will update you guys whenever I have time to work on it and see the outcome.
I'm in Canada so those two options are not available to me. But you give me the idea to call shops here to see if they offer free checks, thank you.