Here is a quick write up on how to access and replace all 4 temp sensors on a octavia 2010 tdi estate 4x4. I live in Norway so this is for a car with wheel on the left side. But I guess it is much the same for you english as well.

So, my fault is as follows, climatronic only gives hot air when knob is set to high. If set to 26, 25, 24 etc degrees, it immediately blows cold air. Both from upper and lower vents. And yes, flap motors are ok and calibrated and yes the aircon if filled and served and yes, the heater core is not the problem.

Vcds/obd shows no fault codes at all. So I did a live scan to log the aircon measures. And there I saw the fron left and front right temp sensor read a temp about 78-84 degrees celsius. Np wonder the climatronic pushed cold air out...

I replaced all 4 sensors when at it. Both the footwell ones and the front upper ones.

How to acces:

Well on left side, pry out the fuse cover on side, pry out the small storage compartment on driver side. Pry out the silver cover around the light switch and also the silver cover on the other side of the steering wheel. Now you will see all T20 torx screws you need to remove. You will now see the airduct for the floor. This is fastened with one t20 torx screw. Remove it and now remove the airduct itself. It is self explanatory this one. And you can now remove the connector from the sensor. Now twist the sensor counter clockwise and take out. That was the lower left temp sensor done.

The lower right sensor access:

Have to remove the glove compartment box. First remove the side cover for the dashboard (facing the door). Use a plastic prytool and just rip it straight off. Then remove all t20 torx screws holding the glove compartment box. There is one on the side, 3 on top (open the compartment box) and 2 on the bottom. When these are out, the whole box will be loose and can be removed. Disconnect the airbag "on-off switch" and also the connector for the light. If you have a hose supplying the box with cooled air, no need to remove this. Just lay the box down on the floor.

No need to undo the lower airduct on this side to remove the lower temp sensor. Again, disconnect wire and turn sensor counter clockwise to loosen and remove. In pics this sensor is marked with red circle.

Now just do the same also for the front right temp sensor. Marked in blue.

So when this is done you have done 3 out of 4 tempsensors. Just one left and that is the front left sensor. This bugger is located behind the radio. Need to take radio out and this is done without special tools.

Remove silver plastic cover around the radio and also the black remaining frame. Use a plastic prytool. Flat screwdriver will do, but be careful, easy to get scratches etc.

Now you will have access to all 4 t25 torx screws. Remove these and just pull radio straight out.

Remove the cables and radio can be placed wherever you like.

And there you will see the temp sensor high up to the left.

Use same procedure on this as well and voila, you have now replaced all 4 sensors likely causing issues like mine.

Best of luck. The front temp sensor have oem nr 3D0 907 543A. The lower footwell sensors called G261 and G262 have oe nr 4B0 820 539.

I replaced all 4 in under 1 hour. Sensors should no more than 40-50 GBP at dealership and maybe 15-20 GBP at autodoc (Vemo, Hella brand)

Hi rbhelle,

I have exactly same issue (but on my Yeti), all 4 sensors are reading a too high temperature.

Did replacing them fixed the issue?

9 minutes ago, joaofpo said:

Hi rbhelle,

I have exactly same issue (but on my Yeti), all 4 sensors are reading a too high temperature.

Did replacing them fixed the issue?

Yup, replacing the faulty ones fixed the issue yes.

As long as you know that sensors are faulty. Need to read sensor temp readings from diagnostics. I use vcds.

Only heat working when set to "HI" and not on any other temp settings=likely one or more sensors are faulty. If blowing heat on either left or right side and temp adjustments are working fine, well, its more likely heat registry or flaps that are faulty. If nothing works....well, good luck 😊

I'm using VCDS also so I'll try to get the sensors and replace them.

Thanks for replying and for the original post!