Radiators fans always on

[Lukaskasc]

Hello, i’ve been having problems with my radiators fans. I think everything started when i charged my AC for the hot weather. The problems is that radiator fans are always on. 2-3 times it was off when i went for work in the morning. But mostly the fans are always on. I thought myabie the temp sensor was bad, but when i unplug it, they stay on. Then thought myabie the relays are stuck and the problem was there. But tried unpluging one by one. Every of them clicks and looks like it works like it should off. Does anyone has any ideas what can it be, because it is running me crazy that it’s always on 😡

[ColinBarber]

There is an AC pressure sensor that turns the fans on when the system goes over a certain pressure (normally when you turn on the AC). Sound like you have pressurised the system too much if it is never turning off.

[Lukaskasc]

Should the fans turn off when ac is turned off?

[ColinBarber]

6 hours ago, Lukaskasc said:

Should the fans turn off when ac is turned off?

Yes it should, but won't if the pressure is too high.

[Lukaskasc]

1 hour ago, ColinBarber said:

Yes it should, but won't if the pressure is too high.

Do you have any idea what the pressure should be on low and on the high side? Found something on is300 i believe it’s the same system but just myabie there are a excat reading for the pressure that should be in the system? Thanks

[ColinBarber]

Running the engine at 2,000 rpm:

[Lukaskasc]

On 9/4/2022 at 12:03 AM, ColinBarber said:

Running the engine at 2,000 rpm:

Saddly that not the problem. Where i live today temperature is about 17 degrese celsius, checked the system pressure it was about 11 kgf/cm on the high side and 1 kgf/cm on the low side. Thursday im taking the car to a local electric to check it over. If he finds anything i will post here for future refrence 🙂

[Lukaskasc]

The problem was, an A/C pressure sensor which was faulty. The sensor is on the EU driver side right behind the grill. 
 

Part number for the pressure sensor: 8864560030

OEM Denso part number: 443440-0050