No cabin heating before 27°C

[Sefosh]

Hello all,

I have an issue with the cabin heating.. I couldn't get hot air before 27°C set.
To precise, If I set to 22°C, I will get hot air the first 5 mins and then it will turn cold and get extremely cold..
So I have to set to 27°C to be "good" in the cabin.

I don't know if someone had the issue.
Previously I had a Seat Leon FR (from 2014) and had to change the heater matrix (because I was losing coolant).
Furthermore, I never heard this type of issue for a 2019 model.
The car went to a SEAT dealership 3 times but they didn't find an issue about the cabin heating..

Does someone had this issue and know how to fix it ?

Thanks to all !

Greetings,

Sefa

 

[thespicemustflow]

Is the aircon set to 'automatic' mode, or is this manual?

(If set to auto, I'd say this is normal behaviour)

 

[Sefosh]

Is the aircon set to 'automatic' mode, or is this manual?

(If set to auto, I'd say this is normal behaviour)

Hello thespicemustflow,

First, thanks for your reply to this thread.

I tested in all conditions (auto, A/C on & off, set to passengers and to feet) and it blows cold air.

For example, if I set to 22°C to power 4 and in direction to passengers and to feet, it will blow lukewarm air and after 5mins cold air..

I also notified that when you press "SETUP" below the button AUTO, I have air flow in red colour (which indicates hot air) only from 23.5°C..

And when I set to 27 to be "good" in the cabin, ten minutes after this setting, if I press "SETUP", I have red flows from 26°C, before 26°C it's blue flows (which indicates cold air).

Greetings,

Sefa

 

[meevilsheep]

Personally i would get a diag tool and do a live reading of the cabin temperature sensor. It doesn`t sound like a clogged heating circuit, since it does blow some warm air.

 

[Sefosh]

Personally i would get a diag tool and do a live reading of the cabin temperature sensor. It doesn`t sound like a clogged heating circuit, since it does blow some warm air.

Hello meevilsheep,

An ODIS diag has been done and you'll find the values to the attached document.
Furthermore, they placed a digital thermometer at the level of the ventilation nozzles which regulates well to the desired temperature (tested at 26°C and it's going from 28.6°C to 26°C..).
However, the test was done when starting the vehicle (cold engine), where I managed to get a little heat.

As you say, I also think that the issue may come from the cabin temperature sensor. If you check the value IDE00983/MAS00194 for the interior temperature. It's about 31°C which is very high, so that could explain why it blows cold air and not hot air ???

Thanks for your help and your comment.

Greetings,

Sefa

 

[meevilsheep]

I think you`ve found the culprit then
Not sure how could there be 31°C inside a car, from a cold start, when the outside temp is 15.5°C. But if that`s the reading, then the ventilation system blows cold air to drop the detected temp of 31 to the "desired" temp of 2X°C.
How come this didn`t raise any questions during the investigation? Especially since they had a digital thermometer on hand

 

[Sefosh]

I think you`ve found the culprit then
Not sure how could there be 31°C inside a car, from a cold start, when the outside temp is 15.5°C. But if that`s the reading, then the ventilation system blows cold air to drop the detected temp of 31 to the "desired" temp of 2X°C.
How come this didn`t raise any questions during the investigation? Especially since they had a digital thermometer on hand

They've sent a video that shows me they set the temperature to 26°C in manual mode and the digital thermometer drops from 28.6°C to 26°C in about 2mins (they've put the thermometer in the middle of the cabin). Then they've put the thermometer at the driver's seat air vent which increased the temperature from 26°C to 28°C.
But as I said, they did the test after starting the car.

I will try to drive 30mins before going to the dealership but I hope they'll have time to do the test immediately..

I am convinced that I am on the right track with the interior temperature sensor and I hope I'll find the issue..

Greetings,

Sefa