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2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
04-20-2016, 12:49 PM (This post was last modified: 04-20-2016 12:50 PM by FirstVW.)
Post: #1
2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
Just bought this car this is not only my first VW but my first European car period. So the ac compressor is not kicking on. I have ground and power coming to the 2 wire plug behind the clutch. Also tryed sending 12v directly to the power side and still no engagement. Is there anything else that would cause this besides a bad clutch or compressor. Undercharge, overcharge, maybe a safety switch somewhere. Any help is appreciated thanks.
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04-20-2016, 01:14 PM (This post was last modified: 04-20-2016 01:15 PM by Rupe.)
Post: #2
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
If you are sure about power and ground the next step is to check the clutch with an ohm meter to see if it's open circuit. You should also double check that ground wire to make sure it has a good connection, seeing as we are dealing with a 15 year old vehicle. Place your ohm meter on that ground wire and the battery neg terminal to be sure. Anything besides a "0" reading is a poor connection someplace.

Another possibility is the clutch circuit is ok, in which case you will hear the noise it makes when it's energized (clicking sound), but the clutch friction surface might be worn, which means the compressor is not turning.

As for switches and safety items, they will open the circuit if the charge is low. That's something we can get into once you verify the clutch situation.

AC clutches and their parts are available in the aftermarket but shop carefully. You may find an entire compressor (including the clutch) is not much more money. OTOH, depending on it's location you may need to open the system for replacement then recharge the system when done. That's another whole level beyond many DIY types.
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04-20-2016, 01:42 PM
Post: #3
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
I stopped by the house for lunch. The ground wire is reading 0.01 I put a cheep gauge on the coolant line and it is actually showing overcharged. I can also hear a little change in the sound of the engine each time it attempts to engage. I have checked around and I can get a reman complete compressor unit cheaper than a clutch kit but then there is the issue of evac and recharge. Thats why I was hoping that there was a chance it wasn't bad.
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04-20-2016, 02:30 PM (This post was last modified: 04-20-2016 02:34 PM by Rupe.)
Post: #4
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
How would you know if it's overcharged if you don't know if the compressor is running? If the compressor is off the low side of the system will read high anyway because that's the static reading. What I mean is the pressure will be the same on both the high and the low side, which is relative to the outside ambient temp and has no bearing on how full the system is. Freon is a funny thing and changes pressure with temp which is part of how the system works, but can be confusing to someone without enough experience in that field.

What could be happening here is the system is just low on charge so the comp kicks in for a second, then the low side pressure drops enough for the safety switch to shut it off again. You would have to watch the front of the comp to see if that's the case. IOW, get a helper to work the switch for you so you can see what's happening with a flashlight.

BTW, if it's low on charge the only way to find the leak is to fill it up. There's a tag on the system telling you how much it holds. Convert the pounds / ounces (or fractions) to ounces then use that as your guide. Freon is sold in odd sizes, usually 11 ounce cans. DO NOT overfill the system. (round off to the nearest 2-3 ounces is close enough)

What I am driving at is if it says 2 pounds of Freon (that's 32 ounces) and they come in 11 ounce cans, you'd buy 3 cans and have 33 ounces. See how that works?
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04-20-2016, 02:50 PM
Post: #5
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
I attempted to put refrigerant in it last night it wouldn't accept it. Thats when I started looking at the compressor and noticed that it is not engaging. I can spin the center part of the pulley clutch system so I don't believe the compressor is locked up. Which is when I checked the 2 wires for the electronic clutch engagement and noticed I was getting voltage there. I appreciate the explanation on why it was showing high I am by no means an expert. I do like learning how to do new things on vehicles though.
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04-20-2016, 04:26 PM
Post: #6
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
Follow the AC pipes and look for a pressure switch. (might look like an oil pressure switch) Might be on or near the item that looks like a tank. Disconnect the plug and jump it with a paperclip then see what happens. If the compressor stays on then the system was low and needs a charge. When you get done, remove the jumper and reconnect the plug.

Do not run the compressor for any length of time with a low charge. The moving Freon also carries the lube oil for the system and without enough Freon you will eventually cause damage. Now you know why there's a low pressure switch!
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04-20-2016, 04:57 PM
Post: #7
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
Ok I will try jumping it when my wife gets back with the car this afternoon I will post an update afterwards.
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04-20-2016, 07:41 PM
Post: #8
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
Just attempted to jump the low pressure switch and still the compressor clutch doesn't engage. So it looks like i'm going to be replacing a compressor.
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04-20-2016, 08:38 PM
Post: #9
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
One more test you should do is with the engine off, power and ground the clutch and listen for the click. When you think it should grabbing try to turn the center of the compressor. If the clutch grabs the belt should keep you from spinning anything. Release the power and see if it spins with slight effort. It should be a slightly bumpy feel as the internal parts try to make pressure. This is to verify the clutch operation BEFORE you jump into replacing something that might not be necessary. It never hurts to double check!
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04-20-2016, 09:32 PM
Post: #10
RE: 2001 Jetta 2.0L 160,xxx 5 speed Manual East Alabama. A/C issues
I tried it and if there is a click it is to lite for me to hear. I am still able to spin the clutch with little effort. After release there is no bumping it spins smooth.
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