2011 polo . New heater resistor pack smells

Micpwelsh · Post by **Micpwelsh** » Mon Sep 06, 2021 10:24 am

Hi I've just changed the resistor pack on my polo , everything is now working great .
The issue I have is I'm getting a weird smell through the air vents , it's kind of like burning plastic.
Should I be worried or will this smell stop after a while ?

Post by **iichel** » Mon Sep 06, 2021 11:06 am

I would be worried. Something smells like it's burning or melting. And you don't know what it is. That's not a very good situation to be in.

Micpwelsh · Post by **Micpwelsh** » Mon Sep 06, 2021 9:27 pm

I've taken a picture of the resistor through the filter box . It doesn't look burnt

Post by **ciclo** » Tue Sep 07, 2021 5:03 am

I guess you should check the resistor pack again.

If you find that the thermal fuse breaks regularly (interval between 1 or 2 weeks) you will have to check the fan motor, the motor shaft should rotate smoothly, without roughness of any kind.

Micpwelsh · Post by **Micpwelsh** » Tue Sep 07, 2021 11:29 am

You have good eyes I didn't notice that or more like didn't know what I was looking for.
Spoke to a local garage, first question he said was did you get the resistor from eBay (I did ).
Might be worth buying a genuine one and try again?.
I think the first resistor broke because the pollon filter was full of fluffy stuff

Post by **iichel** » Tue Sep 07, 2021 12:03 pm

A genuine is also probably just a Hella/Valeo resistor with a VW label on it. But, like ciclo said, you could and perhaps should check the fan itself, does it rotate freely?

Post by **ciclo** » Wed Sep 08, 2021 4:36 am

I leave here the "6R" diagrams on the three possible parts that may be the cause of this failure, ... and which is already widely known:
Note: It is applicable to many other VW group models, ... and other brands.

HEATER (without A/C)

CLIMATIC

A broken resistor pack - thermal fuse (N24) is usually an indication that something is wrong with the Fresh air blower (V2) or the 4 speed rotary switch (E9) on the control unit.

Undoubtedly, poor maintenance of the cabin air filter can be the origin and cause of this failure, and although less frequently, can also be caused by heavy use of the 4-speed switch, the board - integrated circuit - of the control unit may be short-circuited.

Videos that may be helpful: (chosen at random)