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.
Refrigerant Line With Inner Heat EXCHANGER
- In this refrigerant line, the warm liquid refrigerant flowing on the high pressure side releases energy into the gaseous or vaporous cold refrigerant flowing on the low pressure side. This increases the cooling efficiency of the A/C system.
This illustration shows a refrigerant line with an inner heat exchanger as it is installed on for example the Golf 7, the Audi A4 from MY 2008 and on the Audi A5 Coupe from MY 2008. Refer to Refrigerant Circuit (vehicle-specific service information).
A -
Refrigerant line with inner heat exchanger
B -
Channels in the refrigerant line, in which the warm liquid refrigerant flows to the evaporator (refrigerant circuit high pressure side)
C -
Channel in the refrigerant line, in which the gaseous or vaporous cold refrigerant flows to the A/C compressor (refrigerant circuit low-pressure side)
NO RELATED
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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.