Coolant Temp Sensor 1Z

Hello there,

I have another question for you.

The temperature gauge on my Audi 80 Avant B4 1.9L TDI, manufactured in 1994 with engine code 1Z, seems to be malfunctioning.
A while ago, the display was only showing around 50 degrees. I then replaced the thermostat. After that, it started showing around 60 degrees again. > Still too low.
The needle barely moves at all anymore, not even after a long drive on the highway.
After a short distance, the upper hose to the radiator is slightly warm, while the lower hose to the thermostat is ice cold. So, the thermostat should still be working correctly.
I once heard something about faulty voltage regulators causing problems. If that were the case, the fuel gauge should also be malfunctioning. However, it seems to be displaying the fuel level relatively accurately.
So, temperature sensors in the bucket?
Where is he sitting?
Ich habe heute die 2 Kühlwasserstutzen am Zylinderkopf erneuert und konnte dabei 2 Geber ausmachen. 1. Geber ist blau und sitzt in dem Stutzen auf den der obere Schlauch vom Kühler kommt. Hat 2 Pins.
The second pump is located in the other fitting, which is connected to the return line of the heating system.
It's gray and has 3 pins.
I once tested the blue one with the 2 pins. It didn't show continuity at an outside temperature of around 5 to 10 degrees Celsius.
Unfortunately, I haven't measured the others.

I just remembered that I read the temperature with VAG-Com some time ago. It showed approximately 80 degrees Celsius.
Sure, here is the translation of the text from German to English:

"Addendum:"
Could it be that the temperature I'm seeing displayed via VAG-Com is being read by a different sensor?

And how can I, for all the world, change the steering gear boot without having to hang myself up?
End of addendum.

Who can help me?

See you then.
Markus.

zocker100 wrote:

Could it be that the temperature

I am getting displayed via VAG-Com is being read by a different sensor? }
Yes.
For example, in my 1997 Golf 3, there were two separate sensors housed in a single sensor unit.
One is for the engine computer, the other is for the AI.

Hi,

Thank you for the response.
That's reassuring, at least. Then I can probably rule out a broken cable connection to the instrument.

Can someone tell me where the sensor for the faucet display is located?

See you then.
Markus.

Hello,

Just unplug the connectors one by one and wait a few minutes. Then, the "correct" sensor should be easy to identify.

Best regards, Rainer.

Hello there,

I spoke with the friendly person and managed to get what I wanted from them.
Es ist der 3 polige Sensor. It costs 27 euros.
Finally, an ad that actually works. Even if it's just a cheap trinket. It's better than nothing.

Thank you again.

See you then.
Markus.