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.
Servicing Station, Connecting For Measuring And Testing
- Work procedure may vary depending on the type of tools selected (the tool-specific operating instructions should therefore be followed).
The work procedure is always to be performed as described in the operating instructions for the A/C service station.
The charging hoses are to be connected as follows to prevent the ingress of air or moisture into the refrigerant circuit:
-- Turn off the ignition.
-- Connect the service station to the power supply.
-- Remove the caps from the service connections or connections with valve. Refer to USING SERVICE STATION (vehicle-specific repair information).
-- Evacuate the charging hoses if necessary.
-- Connect the quick-release coupling to the refrigerant circuit service connection.
- Never open valves on low or high-pressure side with the engine running. Otherwise, compressor or service station could be destroyed by a short circuit between high and low-pressure sides of refrigerant circuit if air conditioning system is switched on.
-- Only tighten the handwheel in the quick-release coupling just enough so the service connection is open. Watch the pressure gauge and do not place too much pressure on the valve.
-- Start the engine and perform the planned tests and measurements.
-- Compare values determined to specified measured values. Refer to PRESSURES, CHECKING .
-- Before disconnecting the quick-release coupling, close it by screwing out the hand wheel.
Vehicles with Only One Service Connection:
Install the A/C Adapter Set - Adapter 9 VAG1785/9, A/C Adapter Set - Adapter 10 VAG1785/10 or A/C Adapter Set VAG1786 onto the connections with the refrigerant circuit valve and bleed the charging hoses while connecting to the adapters (faintly audible escape of refrigerant gas is permitted). Refer to A/C SERVICE STATION, CONNECTING .
-- The charging hose must be installed with a valve opener for opening valve in valve adapter.
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.