Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Quick-Release Coupling Connections On Refrigerant Line
This illustration shows the quick-release coupling connections with a refrigerant line with an inner heat exchanger as it is installed for example on the Audi A4 from MY 2008 and on the Audi A5 Coupe from MY 2008. Refer to Refrigerant Circuit (vehicle-specific service information).
To remove the refrigerant line -D- the retaining ring -A- must be opened for example with the refrigerant line release ring (Air Conditioner Couplings Release Tool:T40149 or Retaining Ring:T40232 ). Refer to Refrigerant Circuit (vehicle-specific service 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 seal -F- or -J-. Refer to Refrigerant Circuit (vehicle-specific service information) and the 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" Seal
G -
Quick-release coupling connection with "low pressure side" retaining ring
H -
"Low pressure side" support ring
J -
"Low Pressure Side" Seal
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 release tool for air conditioner couplings :T40149/1 , for example. Refer to Refrigerant Circuit (vehicle-specific service information).
On the quick-release coupling -A- version 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-.
On the quick-release coupling -D-, the refrigerant line -C- is being installed in the same manner as on 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- is completely latched to the refrigerant line -C-. Then the ring -E- can be removed from the refrigerant line -C-.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.