Hello everybody, 

First thanks for the wonderful forum. I just bought a used yeti from 2010 and I found a lot of useful info here.

I have some problems with the AC system and I decided to buy a refill/seal can. The instructions are quite clear but it is written that I should fill it up to the pressure recommended by the manufacturer. Never over 60 psi. Unfortunately I did not find such info in the book.

Do you know which one is the right pressure?

Thank you all for the help!

Normal running pressure range in an R134A system is in between 22, and 57 psi with respect to below reference,
https://sciencing.com/normal-running-pressures-r134a-8003413.html

 

Below video also provides some tips, and safety precautions for filling up the gas individually,

https://www.carcarekiosk.com/video/2011_Skoda_Octavia_TDI_CR_2.0L_4_Cyl._Turbo_Diesel/air_conditioner/recharge_freon

Hello Kerem,
Thank you. I was afraid that each car and each AC system has its precise recommended pressure.

1 hour ago, davideilli said:

Hello Kerem,
Thank you. I was afraid that each car and each AC system has its precise recommended pressure.

 

Unfortunately, I am not able to provide any reference from the manufacturer on this.
However, recommendations usually point to a certain range, which is between 20 to 40 psi, rather than a unique figure for TDI/TSI engines of VAG cars.

 

The pressure in the low pressure side of an R134a AC system (system not running) is proportional to the ambient temperature and will be from 30psi at 0°c to 130psi at 40°c.

 

Your instructions no doubt are for filling when the system is running and the low side pressure will be from 20-30psi at 0°c to 25-35psi at 40°c and is absolutely not the way to judge whether the system is sufficiently charged.

 

VAg and all modern systems are filled by weight requiring the old refrigerant to be vacuumed out and the specific weight (525g for example) re-introduced.

 

If you dont have vacuum & recycling facilities & are refilling or topping up from a 13kg cylinder like me or the throwaway can that you have you have to use a guage set and watch the changing values between the high and low side pressures to be able to stop somewhere in the region of the correct fill but even that is a shot in the dark.

 

At normal temp of say 20°c you would hope to achieve 70psi in both the low and high sides with the pump not running and with the aircon switched on full to see the low side drop to 20-30 psi and the high side rise to 100-150 psi but with the variable output compressors with the N280 modulating valve you are never likely to get the pump running at 100% like you could on an older E/M clutch compressor that was either full on or off.