A/C Refrigerant System, Troubleshooting

A/C Refrigerant System, Troubleshooting

Requirements
- Electrical systems OK
- Vacuum hoses and control systems OK
- Air flow distribution systems OK

Correct and repair as necessary before proceeding.

If any one of the following system conditions exists, check A/C refrigerant system pressures. A/C Refrigerant System Pressures, Checking
- A/C does not cool (cooling has stopped completely)
- Insufficient cooling during all driving speeds or engine speeds (RPM)
- No cooling or insufficient cooling after a period of driving

Compressor Noisy
- Tighten 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 tension or kinks, 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 overcharged
- Discharge A/C refrigerant system, then evacuate and recharge.

With an otherwise properly operating A/C system, water sprays out of instrument panel vents
- Check evaporator drain pipe for proper routing (should not be kinked or pinched).
- Check evaporator water drain valve.
- Must not be plugged with wax, dirt or undercoating (clean if necessary)
- Valve flap must open/close properly
- Check plenum tray.
- Must be properly installed and not damaged