Rick's Free Auto Repair Advice

VW Jetta AC Compressor Clutch Won’t Engage

VW Jetta AC Compressor Clutch Won’t Engage

Diagnose and fix VW Jetta AC Compressor Clutch Won’t Engage

Shops are finding the root problem for a VW Jetta compressor clutch won’t engage may be caused by a fuse box corrosion issue, not a bad compressor clutch or low refrigerant issues as most people suspect (VW calls this a fuse bracket). The fuse box sits under the hood above the battery and can develop corrosion from road salt spray and battery fumes. As the terminals corrode, the fuse box develops excessive resistance and heat that can burn up the plastic frame, also resulting in a burned compressor clutch fuse, wire or simply a compressor clutch won’t engage condition.

The problem fuse bracket can be found on all 2001-2005  VW Jetta vehicles

vw golf dead battery
Dead battery VW golf

Don’t automatically replace the alternator

When the fuse block corrodes, it prevent field power to the alternator and that will test out as a bad alternator if you just rely on a voltage test at the battery. If you fall for that, you’ll replace the alternator and it still won’t charge properly.

Check the AC compressor clutch fuse first

The high amperage power runs through the fuse bracket before going to the positive battery terminal. If the fuse bracket shows signs of corrosion, heat distortion or insulation melting, that heat can also burn the fuse terminals.

Check for corrosion in the fuse box

If you see any signs of corrosion, heat distortion, insulation melting or fuse damage, replace the entire fuse bracket. Conduct a voltage drop test. Voltage drop under load should be almost 0-volts. A voltage drop above 0.30-volts is a sign of excessive resistance. In that case, replace the fuse box.

Replace the fuse box

Disconnect the negative battery cable and then swap in a replacement fuse box. One product is the Dorman Products 924-680. It fits the following vehicles:

2006 Volkswagen Jetta L4 116 1.9L (1896cc)
2006 Volkswagen Jetta
2005 Volkswagen Jetta
2005 Volkswagen Bora (Mexico) L5 151 2.5L (2480cc); Mexico Region
2005 Volkswagen Jetta
2005 Volkswagen Jetta
2004 Volkswagen Jetta
2004 Volkswagen Jetta
2004 Volkswagen Jetta
2003 Volkswagen Jetta From VIN 1C3433166
2003 Volkswagen Jetta
2003 Volkswagen Jetta
2002 Volkswagen Jetta
2002 Volkswagen Jetta
2001 Volkswagen Jetta wo/80AH/380A Battery
2001 Volkswagen Jetta From VIN 9M1081201
2000 Volkswagen Jetta wo/80AH/380A Battery
1999 Volkswagen Jetta
Reattach all the cables and then apply a corrosion resistant dielectric grease or quick spray of Fluid Film

Dorman 924-680Dorman fuse box
©, 2019 Rick Muscoplat

Posted on by Rick Muscoplat


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