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Weak or warm AC has 4 likely causes: low refrigerant, failed compressor, blocked condenser, or cabin filter clog. Diagnostics start with refrigerant pressure check.
In our network we see these in roughly this order. Diagnostic comes first — never authorise a repair without a written diagnostic report.
Slow leaks lose 10-15% per year. Recharge alone is a temporary fix — locating and sealing the leak is the proper repair.
Compressor cycles too quickly or doesn't engage. Clutch coil replacement (₹4,500-9,500) is half the cost of full compressor replacement.
Air can't cool the refrigerant. Caused by leaves, debris, or front-bumper stone damage. Sometimes just needs cleaning.
Weak airflow even on max fan. Replacement: ₹400-1,200, 15-minute job. Should be done annually anyway.
Recharge + leak test: ₹1,500-3,500. Compressor clutch: ₹6,500-14,500. Full compressor: ₹15,000-35,000. Cabin filter: ₹800-1,500. Always insist on a leak-test before any recharge to avoid throwing money away.
Compressor cycling on/off — usually low refrigerant or evaporator-coil icing. Leak test diagnoses it in 30 minutes.
Cabin filter: yes. Refrigerant top-up: only if cooling is weak. AC system flush every 4-5 years prevents compressor damage from old oil.
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