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VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old March 31st, 2011, 20:04   #1
Join Date: Mar 2011
Location: Texas
TDI(s): golf jetta
Default no fans and no ac need to test compressor

I just bought a 2000 Golf. The cooling fans and ac compressor are both dead. I bought a new fan control module off ebay and had no luck. There are two wires on the AC compressor, which is hot and which is ground? I want to hook power to it for a second just to make sure the compressor does kick on. Anything else to look for? I pulled the fuses on top of the battery and sanded the contacts, still no luck.
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Old April 1st, 2011, 05:22   #2
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Join Date: Aug 2006
Location: Newburgh, NY
Fuel Economy: Jetta: 44.5 summer / 47 on snows

Since it's just a coil, I don't think it'll really matter which way you hook power to it. Ohm it out first to see if it has continuity. This thread should have everything you need:

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Old April 1st, 2011, 06:17   #3
Join Date: Nov 2005
Location: Columbia NJ
TDI(s): 98 NB
Fuel Economy: 40-42

First, engine off, try to turn the inside part of the clutch by hand. If it doesn't turn the compressor is seized.

Attach gauges. Do you have at least 50-60 PSI on both the high and low side? If not add some refrigerant and see if it begins working.

Disconnect the connector and connect a DVOM. Have an assistant start the car and turn A/C to on. Do you have battery voltage? If so you have a clutch issue. If not it could be wiring or a bad switch/relay. If you have low voltage, it usually indicates corrosion at a connector. Time to hit the manual or bring to a professional.

Resistance checks are often inconclusive on A/C clutches.
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Old April 1st, 2011, 06:25   #4
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Join Date: May 2006
Location: San Antonio, TX

If the pressure switch is bad, neither the fans or the compressor will come on, when you turn on the AC. There is a test for the pressure switch that DanG144 explains in his A/c troubleshooting guide. Whatever you do, do not try shorting it with a jumper wire, that will fry your computer.

I highly recommend not buying fan control modules or pressure sensors from ebay. I have seen them cause major headaches.
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