Posts Tagged: AC pressure problems
Learn the Symptoms of a Bad AC Expansion Valve
Top Bad Expansion Valve Symptoms Explained Quick Summary (What You Need to Know Fast) In my experience, a bad car AC expansion valve is one of the most overlooked causes of AC problems. The most common bad expansion valve symptoms include weak cooling, frost buildup, erratic temperatures, abnormal pressure readings, and hissing noises. The only real fix is replacement—but proper diagnosis is critical to avoid wasting money. Why the Car AC Expansion Valve Is So Important I’ve diagnosed hundreds of AC systems over the years, and one thing I can … Read More
Normal Pressures for 134a: The Only Guide You Need
How to Read Pressures for 134a Like a Pro Quick Summary (What You Need to Know Fast) When I check an R-134a system, I expect to see: • Low-side pressure: ~27–32 psi under normal conditions, but can climb to 45–55 psi on hot days • High-side pressure: roughly 2.2–2.5 × ambient temperature (°F) • Readings must always be interpreted relative to ambient temperature and system conditions If your normal pressures for 134a fall outside these ranges, it’s not random—there’s always a mechanical or airflow reason behind it. Why Car AC … Read More