This is the stand alone interview from the June 7, 2025 Hour 1 Show.

Ron Ananian ("The Car Doctor") and Isaac Nielsen of Mahle Aftermarket discuss modern automotive A/C systems, focusing on R-1234yf refrigerant and the importance of proper service equipment.

• R-1234yf replaced R-134a and requires stricter handling due to contamination risks.

• All A/C machines now include oxygen sensors and refrigerant identifiers to ensure refrigerant purity (≥98%) and prevent system damage.

• DIY charge kits and low-quality refrigerants (especially imports) can harm vehicles and equipment.

• Maintenance tips: Check filters for discoloration, clean internal lines with isopropyl alcohol, and flush hoses weekly.

• Oxygen sensors degrade over time, even in storage—only buy replacements when needed, as early shelf life affects performance.

🔧 Bottom line: Use quality refrigerant, maintain your machine, and monitor sensors to avoid costly failures.

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