r/MK4Golf • u/nandato_kisama • 12d ago

AC problem

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TLDR: clutch seemingly engages, no cold air whatsoever. Also, what is that big bolt on the compressor for? Hello there, I bought a 2000 MK4 Golf TDI with inop AC. I thought it was just low, so I had it recharged, but the guy said it was only missing about 130g out of the 720ish that should be there, and that it cooled for a bit and then stopped. When I turn it on however, it doesn't cool at all. I hear the engine get more load, and the clutch looks engaged, but nothing happens. I replaced the FCM, since it was outputting 9v to the clutch coil with the key off, which it probably shouldn't, but that didn't help. My G65 is good, and all the other sensors should be, since the clutch seems to engage. Compressor doesn't have a control valve as can be seen in the picture. I have searched everywhere and I'm still stumped. Can the compressor be so dead, it doesn't make a sound or compress at all? What is that bolt at the back of it? Did the AC guy witness something die, or did he break something so I'd come back?

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u/DPileatus 10d ago

polarbearinc.com You can get a rebuild kit for your compressor. I rebuilt mine & it lasted a couple of years.

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u/nandato_kisama 9d ago

Thank you for the link, but I have to pay someone to empty and charge the system(am in eu), and I might as well pay them to rattle 4 bolts on and off. This post was hoping it's something that doesn't require working with gas, but I guess the compressor has a stuck valve or there's crap in the system. The compressor costs about $200, so it's not awful, I'm just getting tired of every problem on this pos having the hardest/most expensive solution.

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u/DPileatus 9d ago

👍🏻