Hi. Where abouts is the radiator fan switch on a 2016 1.4tdi Rapid? Cheers!

Anybody able to help?

If there is one, it's generally in the radiator a few inches above the bottom hose connection.

It may have a temperature sender instead, mounted somewhere in the pipework near bottom connection.

If you share reg or VIN I can look up the specifics for your car.

What problem are you trying to solve?

I’ve had the emissions and EML lights come on, along with stop/start error.

Scanned and only faults are P0480 (cooling fan control circuit) and P2463 (PF restriction)

Working assumption is clogged up DPF because it can’t regenerate due to a fan issue…

Does the car have air conditioning? If so is it the simple semi-automatic type with knob controls, or the climatronic fully automatic system with screen and buttons?

A look at the wiring for engine (CUSB code?) suggests there is no radiator outlet temperature sender, so there probably is a thermoswitch in the rad.

More car details would really help.

Hi, thanks for the reply!

Car is a 2016, air con is just the basic type.

Reg is GM16YBY

If there is one fitted, the dual thermoswitch is here, item 2, but I have a feeling you may not find one there, because the parts page for radiator fan for your VIN shows 'not for this model' for the thermoswitch.

There is however a separate radiator fan control unit, looking like the one in this listing: https://www.ebay.co.uk/itm/167262171769

It has outputs that go directly to the fan, and inputs from engine ECU for each relay within it (low and full speed). It uses cabin fuse 31 (7.5 amp, ignition switched) and engine bay blade fuse number 1 (40 Amp). Check those first.

Thanks for that. There definitely isn’t a switch in the rad because I replaced it recently and definitely didn’t swap anything over off the old one onto the new, in terms of switches/sensors etc.

I guess the engine ECU relies on the temperature from its G62 coolant temperature sensor alone.

If you want to test the fan itself, unplug the loom connector that goes onto the fan control unit and link contact 9 to 8 for low speed fan, 9 to 10 for full speed. Use a reasonably thick bit of wire, and expect a spark as you make the circuit. Keep hands/fingers well clear of fan blades!

Well the 40a fuse in the under bonnet fuse box is well and truly blown…

Interesting. Get a couple of replacements in case there's a fault that takes it straight out again after you fit a new one.

One possibility might be that the (internal) low speed fan resistor has failed, so it has been trying to start the fan at full speed from a standing start, with more of a surge than if it were already spinning at low speed. Wiring short somewhere is obviously another possibility.

Replaced the 40 amp fuse, hasn’t blown again but lights still both on.

Maybe test the fan itself next, as described yesterday lunchtime?

Fan works when give a direct power feed.

Maybe looking like the fan relay? Any pointers where it might be?

1 hour ago, AlexSimpson said:

Fan works when give a direct power feed.

Both speeds?

Fan control module is going to be hanging off the nearside chassis leg, quite near the radiator, access from below with undercover removed.

Is it still showing a fault code related to fan though? Have you cleared stored codes?

10 minutes ago, Breezy_Pete said:

Both speeds?

Fan control module is going to be hanging off the nearside chassis leg, quite near the radiator, access from below with undercover removed.

Yes works on both speeds