Quick-Release Coupling Connections On Refrigerant Line
The quick-release coupling connections may only be unlocked and opened if the refrigerant circuit is empty.
This illustration shows the quick-release coupling connections with a refrigerant line with an inner heat exchanger as it is installed on the Audi A4 from MY 2008 and on the Audi A5 Coupe from MY 2008. Refer to Refrigerant Circuit (vehicle-specific repair information).
The retaining ring -A- must be opened using the Air Conditioner Couplings Release Tool:T40149 in order to remove the refrigerant line -D-. Refer to Refrigerant Circuit (vehicle-specific repair information).
The quick-release coupling connections -B- and -G- are to be replaced after removing the respective refrigerant line with the corresponding support ring -E- or -H- and the corresponding O-ring -F- or -J-. Refer to Refrigerant Circuit (vehicle-specific repair information) and the appropriate Electronic Parts Information.
A - Retaining ring (in the quick-release coupling connection, high pressure side)
B - Quick-release coupling connection with "high pressure side" retaining ring
C - Refrigerant line with inner heat exchanger
D - "High Pressure Side" Refrigerant Line
E - "High pressure side" support ring
F - "High pressure side" O-ring
G - Quick-release coupling connection with "low pressure side" retaining ring
H - "Low pressure side" support ring
J - "Low pressure side" O-ring
There are different versions of the quick-release couplings -A- and -D-. The refrigerant lines -C- can be released and removed in the same way for both versions of the quick-release couplings by using the Air Conditioner Couplings Release Tool :T40149/1 , for example.
On the quick-release coupling -A- installed at the start of production, the check pins -B- become visible after the refrigerant line -C- is installed, if the locked refrigerant line -C- is pulled in the direction of the arrow.
Beginning with MY 2010, as a running change, the quick-release coupling -D- installed and the refrigerant line -C- are being installed in the same manner as the quick-release coupling -A-. If the refrigerant line -C- is pulled in the direction of arrow after assembling, the ring -E- will come out of the quick-release coupling -D- and will show that the retaining ring -F- s completely latched to the refrigerant line -C-. Then the ring -E- can be removed from the refrigerant line -C-.