Vorglühanlage | Beiträge 16+

Hi,

it happened every time with a cold engine.

Do you happen to know which sensors are involved in this on a 35i?

Best regards,
Rüdi.

Hi,

I don't, because I have a different car (or, more importantly, a newer engine), but you'll definitely find the answer using the search function; the topic has been discussed quite a few times.

Best regards,

Jan

Hello,

On the AFN, there is a plastic connector fitting on the longitudinal side, at the cooling water outlet. A combined temperature sensor is installed there. For the 35i, the yellow/red wire should go to the combined instrument, and the brown/green wire to the control unit.

Regards,

Peter

Let's try something different,

I've noticed that my AAZ Golf would sometimes preheat the engine when I opened the door, opened the door again, and closed it. It would also sometimes not preheat for very long after starting the engine.

Does this happen with TDI engines as well?

It would explain why a TDI engine might not preheat at all (e.g., when getting in, fastening your seatbelt, and starting the engine, there's still enough time for it).

Hi,

no, a TDI doesn't need that, and it doesn't require it either, because it starts up without any preheating in "normal" weather conditions.

Best regards,

Jan

Hello,

I just measured the temperature sensor G62. At an outside temperature of currently 2.5°C, the resistance value is 2.3 kiloohms.

This seems very high, but does anyone know the actual value for this temperature?

Thanks, Rüdi

Hi,
as JanB wrote further up, the resistance value should be higher at low temperatures. If the specified values are correct, then you should be able to measure 5kOhm or more at 2.5°C.
Does it get preheated when you pull out the plug?

Best regards from Berlin
Olli

Hi,

When disconnected, it glows for about 10-15 seconds.

When I use a 4.5 kOhm resistor in series (I've connected two temperature sensors from my old car in series), it also glows for about 10-15 seconds and immediately starts.

Is the G62 faulty?

Regards, Rüdi

Hi

When unplugged, it glows for about 10-15 seconds.

When I use a 4.5 kOhm resistor (I've connected two temperature sensors from my old car in series), it also glows for about 10-15 seconds and starts immediately.

Is the G62 faulty?

Regards, Rüdi

Hello,
then the built-in sensor probably has a short circuit.
Plug it back in; if you get the old problem back, it's broken.
As an alternative, I would measure the cold resistance.
Regards, Günther

Hello,

I've put the plug back in, and now the light doesn't light up, or rather, the light stays on for about 1 second.

I guess I'll have to buy a new one.

Are they also available for sale, or only for around 26 euros at the "friendly" dealer?

Regards, Rüdi

Hello Rudy,

with the "warm" weather today, a reading of 1s can certainly be normal -> use the diagnostic system / VAG-COM to check the temperature values for plausibility. Otherwise, risk spending around 30EUR (the price of the part at my A3) on a new sensor.

Regards, Rainer

Hello Rainer,

When I tested it last night, the temperature was around -2°C, so it should be running well.

I ordered a temperature sensor today; it won't cost me anything, the company will cover it.

Diagnosing with VAG Com won't work; I still need a laptop, but that will be the next investment (you need one for a TDI).

Thanks for now, I'll let you know when I find out if the car is running properly again.

Best regards, Rüdi

Otherwise, I risk spending around €30 (the price of the part at my A3) on a new sensor.

€30? Isn't it worth cutting up the broken part and gluing in a 30ct hot wire with epoxy resin?

30€? For that price, it's worth sawing off the broken part and gluing in a hot wire from Reichelt for 30ct with epoxy resin.

Hello,
using a Digilal voltmeter for 6€ from the hardware store to measure the resistance and then decide!
Regards, Günther

Hi,

I installed the new temperature sensor yesterday evening, and this morning at around 3°C, it was working perfectly (the interior light also became dimmer) and started up as expected for a TDI.

Thanks for your help.

Best regards,
Rüdi

That's good news,

Thank you for the feedback!

Best regards, Georg