When the expansion valve malfunctions

Txv Troubleshooting Guide

Symptoms

Probable Causes

Diagnosis

Corrective Actions

• Pressure extremely high on both low and high pressure sides

• Frost or condensation on piping on low pressure side

Expansion valve malfunction

• Excessive refrigerant in low pressure piping

• Expansion valve opening too wide

Replace expansion valve

(9) When the compressor is defective:

Condition: Air conditioning system does not function.

Expansion Valve Symptoms

Symptoms

Probable Cause

Diagnosis

Corrective Actions

• Pressure extremely high on both low and high pressure sides

• Pressure extremely low on high pressure side

Internal leakage in compressor

• Compression failure of compressor

• Leakage from damaged valve or broken sliding parts in compressor

Repair or replace compressor

3. INSPECT IDLING SPEED

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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