Lupo Air Conditioner: Buy & Save!

Hello!

I have a Lupo manufactured in 2001, with a 3-cylinder AMF 1.4 TDI engine.

The refrigerant was refilled in the system, the compressor turns on, but the fan does not start.

It only has one fan, unlike usual; one for the water and another for the climate control. The climate control pipe gets hot.

Does fan 1 have to start running as soon as the AC button is pressed?

Look, we were just talking about something similar a little while ago.
Okay, I'm ready. Please provide the German text you want me to translate.

Yes. It must start immediately when the air conditioning is turned on, even in winter.

The strange thing is, coming from the wiring harness, I only have two wires: one is rt/white and the other is brown.

The fan connector has 3 wires: rt/ws, sw/red, and brown.

If I directly connect the fan to power, specifically 12V to the red/white wire and ground to the brown wire, the fan does not turn on. It only works when connected to a low voltage/brown wire.

I bypassed the thermal switch, and then power is routed to the RT/white wire, but the fan is not starting.

Are the fans normally switched to two speeds? This would suggest a defect in the first speed setting.

Specifically, the fan control unit should normally apply 12V to the WS/red cable as soon as the AC is turned on.

Best regards, Chris.

Hello!

The Polo 6N2, Lupo, and Seat Arosa models with manual air conditioning did not have a two-stage system, nor did they have a three-pin thermostat switch (despite what the wiring diagrams might indicate). Instead, the system only switched between on and off. Although the fan could operate at two speeds. I believe this feature was only implemented with the Climatronic system.
What I never checked was whether the fan was possibly wired in a way that it always runs through the resistor... SLP connects to either the red or white wire, which goes to the resistor (PIN 2 in the fan's connector).
If you directly apply 12V to pin 1 of the fan... will it spin faster than it did before it failed?
Otherwise, it might be worth considering replacing the pin in the fan connector. However, there's a risk that this could damage the fan control unit (located under the battery).

I don't know how it was before; I received the car like this.

I'm going to get a fan from a recycling center.

Best regards, Chris.

brezelmann01 wrote:

Yes. It must start immediately when the climate control is turned on, even in winter.

Okay, in my Lupo 3L, that's definitely not the case. The fan turns on and off eventually, but not immediately when you press the AC button. You can also clearly hear it, because it sounds like the car is about to take off, and you can also hear the engine slowing down.

Bye.
peace

ATTENTION: See edit four posts below!!!

The ANY is also not comparable to the AMF...

I've rewired the cable, and now the fan runs as soon as the AC button is pressed.

Best regards, Chris.

I think I'll just leave it as it is for now and see what happens.

Hello,

I am revising my previous statement regarding the operation of the radiator fan on the Lupo 3L. I now have a second 3L with air conditioning, and in that car, the fan starts immediately when the air conditioning is turned on. The observed behavior (fan not starting immediately) was due to a defect in the first fan speed setting. The fan has now been replaced, and now the fan also starts immediately on the other 3L when the air conditioning is turned on.

The statement made by brezelmann01 was therefore correct.

Bye.
peace

Great! Thanks for the feedback. I also learned that the Lupo ANY has a two-stage fan, while the AMF has a single-stage fan. Just in case anyone needs this information in the future .