# Why Does My Aircon Keep Losing Gas? | Aircon Expert > Common leak points (flare joints, corroded pipes), leak testing, why repeated top-ups waste money, and the 1-month top-up warranty. URL: https://www.airconexpert.com.my/guide/why-aircon-keeps-losing-gas/ Last-Modified: 2026-10-05 Tags: aircon keep losing gas, aircon gas leak, aircon gas top up scam Aircon Guide # Why Does My Aircon Keep Losing Gas? Leaks vs Top-Up Myths Common leak points (flare joints, corroded pipes), leak testing, why repeated top-ups waste money, and the 1-month top-up warranty. Updated 5 October 2026 6 min read Reviewed by our lead technician ![Greenish corrosion on a copper flare joint at the outdoor unit](/images/featured/greenish-corrosion-on-copper-flare-joint-at-outdoo.webp) ## The Pattern Many Homeowners Recognise We constantly hear the same frustrated story from Klang Valley homeowners wondering why their aircon keep losing gas. The air conditioner blows warm, a technician does a quick fix, and the room gets cold again. A few months later, the system struggles, and the cycle repeats. Our industry calls this the classic AC gas top-up [/aircon-gas-top-up/ →](/aircon-gas-top-up/) trap. Refrigerant runs in a completely sealed loop like your kitchen fridge, meaning it never gets consumed. Every refill without a proper repair simply replaces what just escaped. We will break down exactly where these systems fail and how professionals actually locate the fault. Let’s explore why paying for constant refills is draining your wallet and how to fix the root cause. ## Where Aircons Leak Refrigerant escapes through weak points in the sealed copper line, usually at the connection joints or through corroded metal. We see these failures most frequently at the outdoor flare connections, followed by the coils and piping. Let’s look at the five main culprits. ### 1\. Flare joints This connection point causes roughly 50% of all refrigerant loss issues. A flare joint is the spot where the copper piping connects to the indoor and outdoor units. The installer flares the end of the pipe into a cone shape and clamps it with a brass nut. Our technicians frequently find these nuts overtightened, undertightened, or cracked from vibration. Modern R32 gas runs at very high pressures, meaning a poorly made flare will seep gas almost immediately. **Signs:** Oily residue around the nut, sometimes greenish corrosion. ### 2\. Corroded copper pipes Copper lines degrade naturally, especially when exposed to harsh outdoor elements. Rain, urban smog in the Klang Valley, and general pollution speed up this decay. Over a few years, tiny pinholes begin to form in the metal. ![Corroded outdoor unit fins on a seafront balcony](/images/content/salt-air-corroded-outdoor-aircon-unit-fins-near-pe.webp) We handle a massive volume of these cases in coastal areas like **Penang** and parts of **Johor Bahru**. Salty sea air destroys outdoor units and piping much faster than inland environments. ### 3\. The coil itself Both indoor and outdoor coils often develop microscopic holes from chemical damage. Cheap aircon servicing often involves harsh alkaline chemical cleaners that technicians fail to rinse off properly. Our repair logs show this residue slowly eats into the thin aluminium fins and copper tubing. These specific faults are incredibly difficult to locate and often require replacing the entire coil block. ### 4\. Vibration damage Compressors generate significant movement while running. Pipes rubbing against a concrete wall, a metal bracket, or each other will wear through over time. We usually trace this problem back to a missing component during installation [/aircon-installation/ →](/aircon-installation/) . If the contractor didn’t mount the outdoor unit on rubber vibration pads, the constant shaking creates fatal friction points across several areas: - **Bracket edges:** Where the copper line meets the metal support. - **Wall penetrations:** Where pipes push through raw concrete. - **Casing contact:** Where internal lines rub against the compressor shell. ### 5\. Service valves The access valves on the outdoor unit allow technicians to connect their manifold gauges. These connections rely on two small but critical parts: - **Schrader valve cores:** These look exactly like the air valves on your car tires. - **Brass sealing caps:** The primary heavy-duty cover that traps the pressure. Our maintenance checks often reveal worn or completely perished rubber O-rings inside these components. Once that rubber degrades, the high-pressure gas pushes straight past the seal. ## How We Find the Leak Locating a tiny pinhole requires patience, specific diagnostic tools, and a systematic testing process. We pinpoint the exact failure using a combination of pressure isolation and electronic detection. A quick 15-minute visual check is never enough. Professional detection involves several distinct steps: 1. **Pressure check.** A Fieldpiece digital manifold gauge confirms the exact pressure drop in the system. 2. **Visual inspection.** Oily residue at the brass joints often marks the exact escape route. 3. **Soap bubble test.** Soapy water brushed onto suspect joints will bubble actively where pressure escapes. 4. **Electronic leak detector.** A handheld Inficon sensor run slowly along the piping detects invisible refrigerant in the air. 5. **Nitrogen pressure test.** For microscopic holes, the system gets pressurised with nitrogen up to 600 PSI so even the smallest faults become obvious. ![Technician running an electronic leak detector along the piping](/images/content/technician-using-electronic-leak-detector-along-ai.webp) ## Fixing It Properly A permanent solution involves physically repairing the damaged copper before recharging the system. Our aircon repair [/aircon-repair/ →](/aircon-repair/) team cuts out the fault, replaces the weak components, and restores the sealed loop. Every repair job requires strict procedures to protect your compressor. We completely vacuum the lines down to 500 microns to remove all moisture. Leaving moisture inside creates a highly corrosive acid when mixed with the compressor oil. The specific fix depends entirely on the location of the damage: - **Flare joints** get cut back, re-flared with a proper eccentric flaring tool, and reconnected using a torque wrench. - **Damaged pipe sections** are cut out and replaced with fresh copper. - **Faulty valve cores** receive brand new Schrader valves and heavy-duty brass caps. - **Coil leaks** are assessed for viability. Small ones may take a brazing repair, while large blowouts on a 10-year-old unit mean it’s time to replace the part. After the repair, the technician recharges the system with the exact weight of refrigerant specified by the manufacturer. Our guide to R32 vs R410A vs R22 [/guide/r32-vs-r410a-vs-r22-refrigerant/ →](/guide/r32-vs-r410a-vs-r22-refrigerant/) explains exactly why the specific gas type matters for your cooling performance. The final bill includes a standard repair labour rate of **RM80 to RM200** depending on the complexity of the job, plus parts and the required gas. Our team always quotes the full, final price before touching your equipment. ## Why Repeated Top-Ups Waste Money Paying for an aircon gas top up scam every three months drains your wallet and slowly destroys your equipment. A proper repair costs more upfront but guarantees the system actually holds its charge and protects the motor. Running an air conditioner low on refrigerant forces the compressor to run dangerously hot. This extreme heat degrades the lubricating oil and significantly shortens the lifespan of the entire unit. | Approach | What happens | | --- | --- | | Top up only | Cold for a while, then weak again. You pay for gas every few months, and the compressor runs short of gas in between, which strains it. | | Find and fix the leak, then top up | Higher cost once. The system holds its charge, cools properly and the compressor lasts longer. | We see homeowners try to save RM150 on a quick refill, only to face a massive hardware failure later. A brand new original compressor replacement in Malaysia costs anywhere from **RM1,500 to RM4,000**, excluding installation labour. > **The question to ask** > > If someone offers to top up your gas, ask: “Where is it leaking from?” If they cannot show you the exact hole, the problem isn’t solved. ## How to Prevent Leaks You can prevent the vast majority of refrigerant loss by insisting on quality installation and scheduling regular professional maintenance. While some wear is inevitable with age, good habits keep your system sealed for over a decade. Our service logs prove that proactive care drastically reduces unexpected breakdowns. Focus on these specific maintenance habits to protect your investment: - **Get the installation right.** Properly made flare joints, correct torque on the nuts, and a deep vacuum before charging prevent a large share of the failures we see later. - **Mount the outdoor unit on vibration pads.** Keep all copper pipes from rubbing against concrete walls or metal brackets. - **Rinse coastal outdoor units.** In salty areas, regular servicing that includes washing the outdoor coil slows the corrosion process. - **Avoid harsh cleaners on coils.** Uncleaned alkaline residue from strong chemicals will eat into the aluminium metal over time. - **Do not ignore early signs.** Oily marks at joints, ice frost on the copper pipes, or slowly weakening cooling are urgent warning signs worth checking before the system runs empty. ## What It Means if Gas Is Low on a New Unit If a unit that is only a few months old requires a gas refill, the installer made a critical error during setup. A brand new system losing pressure indicates a poorly made flare joint, a loose nut, or lines that were never vacuumed. Our technicians encounter this specific issue constantly with rushed contractor jobs. Because modern refrigerants operate under extreme pressure, even a microscopic gap in a new joint will push all the gas out within weeks. The fault must be physically repaired immediately, not just temporarily topped up. If we installed your system, this repair falls fully covered by our 30-day workmanship warranty within that period. ## Our Warranty We guarantee our repair work to ensure you never pay twice for the same unresolved issue. Standalone gas top-ups carry a strict **1-month warranty** against immediate pressure loss. Our complete repair services offer significantly more protection for your home. When a technician fixes a hole and recharges the system, you also receive a 7-day follow-up check to confirm the pressure holds steady. Every Complete Overhaul [/aircon-overhaul/ →](/aircon-overhaul/) service includes a free top-up after a comprehensive pressure check. If your aircon has needed gas more than once this year, WhatsApp us the brand, the age of the unit, and how often it has been refilled. We will dispatch a team to the Klang Valley to find out exactly why your system keeps failing. FAQ ## Quick Answers Should I top up gas every service? No. Only if a pressure check shows it's low. A healthy sealed system doesn't need regular top-ups. Can leaks be repaired? Yes, most of them. Flare joint leaks are usually re-made, and damaged sections of pipe can be replaced. Does salty air cause leaks? Yes. Coastal salt air, for example in Penang and Johor Bahru, speeds up corrosion of copper pipes and joints on outdoor units. How long will a top-up last if there's a leak? It depends on the size of the leak. Small leaks can take months, large ones days or weeks. Either way, it will run low again. Keep Reading ## Related Guides ### Does My Aircon Really Need a Gas Top-Up? Signs of Low Refrigerant Weak cooling, frosted pipes and hissing explained, how a pressure check works, and why sealed systems shouldn't need routine top-ups. Read → [Does My Aircon Really Need a Gas Top-Up? Signs of Low Refrigerant →](/guide/does-my-aircon-need-gas-top-up/) ### R32 vs R410A vs R22: Aircon Refrigerant Types Explained Which aircons use R32, R410A or R22, the R22 phase-out, R32 handling considerations, and why refrigerants can't be mixed. Read → [R32 vs R410A vs R22: Aircon Refrigerant Types Explained →](/guide/r32-vs-r410a-vs-r22-refrigerant/) ## Learn more about AC Gas Top-Up Prefer a technician to take a look? We respond within 24 hours, 24/7, and confirm the price before any work. View gas top-up prices [/aircon-gas-top-up/ →](/aircon-gas-top-up/)