LIQUID LINE RESTRICTION TROUBLESHOOTING GUIDE (for TXV systems – R-410A or R-22) If you’re seeing HIGH subcooling HIGH superheat LOW suction pressure… 99% chance you have a liquid line restriction. Here’s how to prove it fast. Common Symptoms • Suction pressure way too low • Superheat 30–60°F • Subcooling 20–40°F • Liquid line cold in one spot, warmer after • Weak airflow out of vents • Compressor super quiet (starved) Quick Checks Before You Tear Anything Apart 1. Dirty filter? Change it 2. Dir
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