DO NOT ASK QUESTIONS HERE! If you need help with your car, start a new forum post in the appropriate section.
On the VW mk4 platform, the Fan Control Module (J293) is dumb, you can't scan it VDCS or the factory scan tool. If the A/C doesn't work, it will require old fashion detective work.

J293 pin out chart:



MK4 A/C quick and dirty checking:
A/C compressor clutch? Radiator Fans? Sensor
Nope Nope Ambient Temp Sensor (F38) @ T14/5 and T14/14
Nope Nope Signal from the Instrument Cluster @ T14/13
Nope Nope High Side Pressure Sensor (G65) @ T14/2
Nope Yes Issue with A/C clutch circuit (N25)
Nope Yes ECM/TCM signal @ T14/3

  • Terminals can rot inside the terminal housing of the J293. Using a hook tool, gently tug on each of the wires to verify they have not come apart.
  • If the Ambient Temp Sensor (F38) is bad, unplugging it and shorting the terminals together will fix the A/C system after 2 minutes @ idle.
  • While the Fan Control Module (J293) is dumb as dirt, it does monitor amp draw of the A/C Clutch (N25). If the draw is out of factory design (open or short circuit), the Fan Control Module (J293) can cut power to the A/C Clutch (N25).
  • A/C Clutch (N25) should be about 4.5 ohms.