Why does my aircon blow warm air after working fine for years?

It's most often a refrigerant leak developing at a joint, valve, or coil over time from vibration or corrosion. Low gas reduces cooling capacity and can eventually damage the compressor if ignored.

Is topping up gas without finding the leak a bad idea?

Yes. If the leak isn't found and sealed, the new gas will leak out again, often within weeks or months, and you end up paying for repeat visits.

Can ice on the pipes mean something other than a gas leak?

It can also mean a dirty filter or blocked airflow, so a technician should check both before assuming it's just refrigerant.

Aircon gas leak repair (low gas / not cooling)

An aircon that runs but stops cooling properly, or that ices up on the indoor coil, is usually low on refrigerant gas because of a leak somewhere in the line set or coil. This is one of the most common repair calls in Penang's climate, where units run almost daily and small leaks get worse fast.

A proper job involves leak detection (soap test, nitrogen pressure test, or electronic sniffer), fixing or re-flaring the leaking joint, vacuuming the line to remove moisture and air, then recharging with the correct refrigerant type and amount. Simply "topping up gas" without finding the leak is a short-term patch that many shady operators sell, and the gas runs out again within weeks.

Ask whether the technician does a leak test before recharging, not just a top-up
Check what refrigerant your unit uses (R22, R410A, R32) since price and availability differ
A unit that ices up on the pipes or indoor coil is a strong sign of low gas or blocked airflow, not just a normal fault

What it costs

Cost depends on whether it is a simple top-up, a leak repair plus recharge, or a full coil replacement if the leak can't be sealed. Refrigerant type matters too since R32 and R410A systems are priced differently from older R22 units. Get a diagnosis first before agreeing to a recharge price, since a leak that isn't fixed means you pay again in a few months.

Top 3 by our score

Ranked from our published scoring of public Google reviews for aircon repair & servicing.

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3. Hooi Air Conditioning & Elec Service
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FAQ

Why does my aircon blow warm air after working fine for years?: It's most often a refrigerant leak developing at a joint, valve, or coil over time from vibration or corrosion. Low gas reduces cooling capacity and can eventually damage the compressor if ignored.
Is topping up gas without finding the leak a bad idea?: Yes. If the leak isn't found and sealed, the new gas will leak out again, often within weeks or months, and you end up paying for repeat visits.
Can ice on the pipes mean something other than a gas leak?: It can also mean a dirty filter or blocked airflow, so a technician should check both before assuming it's just refrigerant.

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