Can the Toptes TR‑389 Really Find Tiny A/C Leaks? We Test It!

In this video, I put the Toptes TR‑389 refrigerant leak detector to the test on a Ram 1500’s air conditioning system to pinpoint a stubborn refrigerant leak. The TR‑389—also known as the RT‑389—is equipped with a high‑precision Japanese semiconductor sensor and offers three adjustable sensitivity modes (high, medium, low), capable of detecting leaks as small as 3 grams per year. Its 14.5‑inch flexible gooseneck makes it easy to reach tight spots in the engine bay or under the dash.

During the test, I walk through the setup process: powering on the detector, selecting the sensitivity mode, and methodically sweeping around A/C components—evaporator, condenser, hoses, and fittings—to watch for audible beeps, visual alerts, and vibration feedback. You’ll see the live TFT color display switch between concentration funnel mode and real‑time curve mode, making it easier to track where refrigerant levels spike. When it detects a leak, the unit emits a loud 90 dB tone, flashes lights, and vibrates, confirming the source.

The TR‑389 runs on a rechargeable 2000 mAh battery with up to eight hours of continuous use and charges via USB‑C. It’s designed for durability with a rugged, dust‑ and explosion‑resistant housing, making it ideal for automotive and HVAC applications. It also covers a wide range of refrigerants, including CFCs, HCFCs, HFCs, HFOs, and hydrocarbons, offering serious flexibility for diagnostics across multiple systems.

By the end of the video, I confirm the exact location of the refrigerant leak in the Ram 1500 and share some practical tips on using the tool effectively. If you're hunting down an A/C issue, the Toptes TR‑389 is a reliable and affordable option to get the job done right.



Where to Buy

https://www.amazon.ca/dp/B0DSHTX11Z?m...

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