[Bucky64]

My 2003 Passat V6 over-heats when in stalled traffic with the A/C turned ON. The secondary small fan has no power. My independent mechanic has checked the fuses and replaced the fan control relay, but still no power. What next?

 

[FrescoGreen01.5]

The auxiliary coolant (radiator) fan is controlled differently depending on the engine.

The 1.8T uses two relays under the dash.

The V6 uses a fan control module, which is under the hood on the left frame rail. It depends on two fuses:
> The 40 amp fan motor fuse on the aux relay panel
> The 5 amp control power fuse, which I think is also on the aux relay panel.

EDIT: The fan control module also powers and controls the afterrun coolant pump (only present in the V6, hence the difference). I think it's powered from the 5A fuse, so a failed afterrun coolant pump could blow the control fuse and thus disable the aux coolant fan.

In all cases, the fuses are not in the main fuse panel.

 

[ar393]

I have a lot of info on where everything is inside the relay panels in this thread
https://www.passatworld.com/forums/...ruise-works-no-other-lights-no-obd-codes.html