I own a 1999.5 MK4 Jetta GL. I am begining to think that the air conditioning system needs to be recharged. There are no leaks as far as I know because the AC works as it blows cool air and dehumidifies the air.
The Bentley sais that when the AC is engaged with the fan on 4 and the engine running @ 1500 rpms, then the temperature should drop to 10 degrees Celcius at the dashboard vents WITHIN 1 MINUTE!
In my case this does not happen at all. While cool air indeed starts to blow, it might take it good 10 minutes of operation for the air to be well chilled.
This makes me think that my AC system needs to be recharged.
Now the Bentley also sais that our AC systems require R134a refrigerant AND some synthetic AC compressor oil. This is my primary concern! I know I can recharge my AC at any AC shop since but what about this compressor oil?
Is it the same as the engine coolant (G12): don't mix it with the one for american cars? Or is it designed to meet certain environment standards and it is interchangeable with any compressor oil?
Any thoughts and knowledge will be greatly appreciated!