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From a set of Passat wiring drawings I used when fitting my Climatronic, the terminals associated with the 4 pin plug on the FCM are: T4/4 12V Feed from battery T4/3 Signal from F18 the radiator thermo switch T4/2 Fan speed 2 T4/1 Fan speed 3 The fuses are: S78 5A fuse for the coolant pump S108 20A fuse for fan stage 1 and a/c magnetic coupling (although to me it appears that stage 1 is fed directly from the thermo switch which may then suggest this fuse is stage 2….hypothesis only!). S107 50A fuse for fan stage 2 & 3 So if the 20A fuse keeps blowing, is there a chance you have a short to ground on the a/c magnetic coupling wiring from when you removed it? The magnetic clutch feed is on the 10 pin plug T10/10…or it is on mine which replicates the Passat at least. Or is the short on one of the fan stages, 1 or 2 dependent upon which stage fuse S108 feeds.

From the VIN number, mine was produced 342 from the end of the production run so they were probably using up the parts they had left, and I’ve owned it since it was less than five years old so I expect it’s the original one too as it was too new for things to have started breaking! No UK cars were built with a/c but mine is definitely 2 plug and I’m sure that both plugs were wired when I fitted the Climatronic, I just had to add extra wires to the smaller plug.

Toby just replied, myself and Fendervg are Moderators again 👍