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.
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HOMESERVICE MANUALSVOLKSWAGEN2017GTI AUTOBAHN, AUTOMATIC DCT TRANSREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING SYSTEM (GENERAL & SERVICE INFORMATION - REFRIGERANT R1234YF - 1 OF 387 AIR CONDITIONINGREFRIGERANT CIRCUITGENERAL DESCRIPTION - REFRIGERANT CIRCUIT COMPONENTSREFRIGERANT CIRCUIT LAYOUT AND FUNCTION
2017 Volkswagen GTI Autobahn, Automatic DCT Trans
Refrigerant Circuit Layout And Function
2017 Volkswagen GTI Autobahn, Automatic DCT TransSECTION Refrigerant Circuit Layout And Function
- The condenser, receiver/dryer and the restrictor or expansion valve to separate the high pressure side (HD liquid sides) and low pressure side (ND liquid sides) ends are located on the high pressure side.
- High pressure results from the restrictor or expansion valve forming a constriction and causing the refrigerant to accumulate, thus leading to an increase in pressure and temperature.
- Excess pressure is generated if too much refrigerant or refrigerant oil is added, the condenser is contaminated, the radiator fan is faulty, the system is blocked or if there is moisture in the refrigerant circuit (the restrictor or expansion valve freezes).
- Located on the low pressure side are the evaporator, the evaporator temperature sensor and compressor to separate low pressure side (ND gas sides) and high pressure side (HD gas sides).
- A drop in system pressure can be caused by loss of refrigerant, faulty or plugged restrictor or expansion valve (no constriction), a malfunctioning A/C compressor or an iced-up evaporator.
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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.