I've noticed that when i turn my airco on, it uses about 2L of fuel according to the maxidot. At 50Km/h with the arico on it uses around 5L/100km and off it uses 3L/100km

This is tested this using the cruise control and turning it on/off multiple times. When i googled what it should be using: it would be anything between 5% to 15% depending how fast you drive. (5% would at the highway, while 15% would be at 30km/h).

I don't know what your question is, but the load will vary all the time as it adjusts to keep the temperature.  It will be on full load when first used to bring the temperature down then ease off to maintain it.  What temperature do you have it set at?  If you've got it set at 16c it will be on full load for a much longer time. Outside temperature will also play a part.

From your fuel use figures something is wrong for sure. i would have the gas charge tested, as the aircon gas also carries the oil used to lubricate the compressor.

Surely a 1.5tsi is under warranty?

3 minutes ago, ords said:

I don't know what your question is, but the load will vary all the time as it adjusts to keep the temperature.  It will be on full load when first used to bring the temperature down then ease off to maintain it.  What temperature do you have it set at?  If you've got it set at 16c it will be on full load for a much longer time. Outside temperature will also play a part.

 

outside temp is 24, inside is set at 21. Car is always kept in a garage. Test was done after 10 minutes of driving.

I forgot to add my question in my post: Is it normal just that engine consumes so much when the airco is on?

 

Does the consumption go down after you have had it on for a while (20 mins?)  As said above the consumption will be at the worst when just turning it on.  Continuously turning it on/off will not do it any good either and potentially cause it to use even more.  A better test would be to use it for a number of days turned on then again turned off.

19 hours ago, MarkyG82 said:

Does the consumption go down after you have had it on for a while (20 mins?)  As said above the consumption will be at the worst when just turning it on.  Continuously turning it on/off will not do it any good either and potentially cause it to use even more.  A better test would be to use it for a number of days turned on then again turned off.

 

Did the test: Numbers are now 0,5 liter after a 20 min drive (incl highway) when turning it off and on when driving 70Km/h. did not know these numbers difference so much within a such a short timespan.