System, Troubleshooting

A/C REFRIGERANT SYSTEM (R-134A), TROUBLESHOOTING

Test requirements

Using VAG 1551 Scan Tool (ST), check Diagnostic Trouble Code (DTC) memory for any electrical, vacuum or air distribution malfunctions, see Repair Groups 01 and D8, On Board Diagnostic (OBD) - Air conditioning; correct/repair as necessary before proceeding.

- If one of the following conditions exists, follow recommended service:

A/C does not cool (cooling has stopped completely)

- check A/C system pressures

Insufficient cooling during all driving speeds or Engine Speeds (RPM)

- check A/C system pressures

A/C compressor noisy

- tighten A/C compressor and compressor bracket mounting bolts using torque wrench

- check routing of A/C refrigerant hoses and lines; hoses and lines must not contact other components and must be installed without binding, reposition or realign as necessary A/C compressor noisy Immediately after switching A/C ON and/or when driving around corners or braking (refrigerant shock) - system Is overcharged

- discharge A/C refrigerant system, evacuate and recharge With an otherwise properly operating A/C system, water sprays out of Instrument panel vents

- check evaporator water drain hose for proper routing (should not be kinked)

- check evaporator water drain valve

^ must not be plugged with wax, dirt or undercoating (clean it necessary)

^ valve flap must close properly

- check plenum tray

^ must be properly installed and not damaged