Car AC Service Guide: What's Included, Cost & When to Book

• Blowing less cold than it used to — the most common complaint. Usually caused by low refrigerant charge (slow leak) or a dirty condenser coil.
• AC taking longer to cool the cabin — refrigerant below optimal charge means the system runs longer to achieve the set temperature.
• Musty or foul smell from vents — bacteria and mould growing on the evaporator coil. Caused by the coil remaining wet (blocked drain) or overdue cabin air filter. Evaporator chemical cleaning resolves this.
• Water dripping inside the cabin (onto footwell) — blocked evaporator drain pipe. The condensate that should drain under the car backs up and drips inside.
• AC compressor noise — clicking, rattling or knocking when AC is switched on indicates compressor bearing or clutch wear.
• AC warning light (on modern cars) — low refrigerant pressure triggers the ECU to disengage the compressor to prevent damage.

A complete AC service at GarageNation includes:

1. Refrigerant pressure check — using manifold gauges to check both high and low side pressures. This diagnoses undercharge, overcharge, compressor failure, and expansion valve faults — all before any gas is added.
2. Cabin air filter replacement — a clogged cabin filter restricts evaporator airflow, reducing cooling efficiency. Should be replaced every 15,000 km in Hyderabad's dust.
3. Condenser coil cleaning — the condenser sits in front of the radiator and collects road dust, insects, and cotton. Blocked condenser fins reduce heat rejection, increasing compressor head pressure and reducing cooling.
4. Evaporator antibacterial treatment — chemical cleaning of the evaporator coil to remove mould and bacteria causing musty smells.
5. Refrigerant recharge — if pressure is low, refrigerant is added to the manufacturer specification. Always by weight on a recovery/recharge machine — not by "feel" or pressure alone.
6. Compressor oil check — the compressor lubricating oil circulates with the refrigerant. Oil-contaminated refrigerant can damage seals.

Never mix refrigerants. Never add R134a to an R1234yf system — it will contaminate the entire system, requiring full evacuation and recharge. GarageNation has dedicated R1234yf recovery/recharge equipment for European cars.

How often should car AC be serviced in Hyderabad?

Every 12–15 months or at each annual service. Hyderabad's 9-month summer means the AC runs almost year-round — more use means more refrigerant loss through micro-leaks in hoses and seals, and more dust accumulation on the condenser. Cabin air filters should be replaced every 15,000 km in Hyderabad's dust.

Why does my car AC smell musty?

The evaporator coil stays wet after the AC runs, creating a perfect environment for mould and bacteria growth. The musty smell is released when the blower fan starts. Fix: evaporator antibacterial chemical treatment (₹500–₹1,200 at GarageNation). Also replace the cabin air filter if overdue — a dirty filter traps moisture and accelerates mould growth.

How much does AC gas recharge cost in Hyderabad?

R134a gas recharge at GarageNation costs ₹800–₹1,800 for up to 500g. R1234yf (used in European cars from 2019+) costs ₹3,500–₹7,000 for the same quantity. Note: if there is a leak, adding gas without fixing the leak is a temporary fix — GarageNation always checks for leaks before recharging.

Why does my AC work but not cool well?

Most common causes: low refrigerant charge (slow leak), blocked condenser fins (clean with water), dirty cabin air filter restricting evaporator airflow, or a faulty expansion valve not metering refrigerant correctly. A proper diagnosis with manifold gauges identifies the cause — GarageNation never adds gas without first measuring system pressure.

📞 Free pickup & drop

Call: +91 8106316369  |  WhatsApp us  |  Book online