Coimbatore's summer is brutal. From March through June, temperatures regularly touch 38–40°C, and the moment your AC starts blowing warm air, everything else stops mattering. The frustrating thing is that most AC failures during summer follow predictable patterns — and many of them are preventable.
Here's what's actually happening when your unit stops cooling, and what you can realistically fix yourself before calling a technician.
The Most Common Reasons an AC Stops Cooling
1. A dirty or clogged air filter
This is the cause of at least 40% of "AC not cooling" calls we receive. A filter that hasn't been cleaned in 3–4 weeks gets so clogged that airflow drops dramatically, and the unit can't absorb or expel heat efficiently. The result: your room feels warmer, the compressor overworks, and eventually shuts down.
Fix it yourself: Turn off the AC. Remove the front panel and slide out the filter. Rinse it under running water. Let it dry completely — 30 minutes in the sun — and reinstall. Your AC will often start cooling significantly better within minutes.
2. Blocked outdoor unit
The outdoor condenser unit needs airflow on all sides to release heat. If it's surrounded by furniture on a balcony, overgrown by plants, or covered in dust and debris, it can't do its job. You'll notice the room cools slowly or not at all, even though the unit seems to be running normally.
Clear at least 30cm of space around the outdoor unit. Hose down the fins gently if they're visibly dusty — but turn the power off first.
3. Low refrigerant (gas leak)
Refrigerant is the substance that actually transfers heat. ACs don't "use up" refrigerant — they run on the same charge for years. If yours is low, there's a leak somewhere in the system. Signs: the AC runs constantly but barely cools, and you may see ice forming on the copper pipes near the indoor unit.
Low refrigerant is one of those problems that gets worse the longer you wait. Running a unit with insufficient gas damages the compressor — the most expensive component in the system.
This is not a DIY fix. Refrigerant handling requires certification and equipment. A technician will locate the leak, repair it, and recharge the system.
4. Tripped circuit breaker or electrical fault
During peak summer, power fluctuations are common in Coimbatore. A voltage spike can trip the AC's circuit breaker or blow its internal fuse. If the AC turns on but the compressor doesn't start, check your electrical panel first.
5. Faulty thermostat or remote
Before calling anyone, replace the remote batteries. A weak signal can cause the unit to receive incorrect commands — running in fan-only mode while you think you've set it to cool.
When You Should Call a Technician Immediately
Some situations need professional attention and shouldn't wait:
- Ice forming on the indoor unit or copper pipes
- The outdoor unit's fan is not spinning when the AC is on
- A burning smell or electrical burning odour from either unit
- Water leaking from the indoor unit onto the wall or floor
- The AC short-cycles (turns on and off every few minutes)
The Annual Servicing You're Probably Skipping
Coimbatore's air has high dust and pollen levels, especially near the textile belt areas. Without an annual service — which includes deep cleaning the coils, checking refrigerant pressure, clearing the drain line, and lubricating the fan motor — even a good AC will degrade faster than it should.
Most manufacturers recommend servicing every 6–12 months. If yours hasn't been serviced in over a year, schedule one before summer peaks. Book an AC service through Working Class — our technicians are background-verified and carry the tools to do the job properly.
Quick Troubleshooting Summary
- AC on but no cool air: Check filter first, then outdoor unit clearance, then thermostat setting
- AC not turning on: Check circuit breaker, then remote batteries, then call for electrical diagnosis
- AC cooling slowly: Likely dirty filter or blocked condenser — clean both
- Ice on pipes: Turn off AC immediately, run fan-only for 30 mins, then call a technician
- Water dripping indoors: Drain line is blocked — a technician can clear it in under 20 minutes
Frequently Asked Questions
How often should I clean my AC filter in Coimbatore?
Every 2–3 weeks during heavy use (summer months). The dust levels in Coimbatore, especially in industrial and textile areas, clog filters faster than in most cities. A clean filter also reduces electricity bills by 5–10%.
Can I recharge AC refrigerant myself?
No. Refrigerant handling requires certified equipment and training. More importantly, if your unit is low on gas, there's a leak that needs to be found and fixed — simply topping up the gas without fixing the leak is a short-term fix that will cost more in the long run.
My AC is 8 years old and stops cooling. Should I repair or replace it?
If the compressor is working and the issue is a gas leak or dirty coils, repair is worth it. If the compressor itself has failed, replacement is usually more economical for units over 7 years old. A technician can diagnose which component has failed before you make that decision.
What's the average cost of an AC service in Coimbatore?
A standard AC service (cleaning, check-up) typically costs ₹600–₹1,200 depending on the unit type. Gas refill adds ₹1,500–₹3,000 depending on the refrigerant type and quantity needed. Working Class technicians provide transparent pricing before starting work.