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A musty smell from AC vents is mould growing on the evaporator coil or in the cabin filter. Easy to fix in 30 minutes.
In our network we see these in roughly this order. Diagnostic comes first — never authorise a repair without a written diagnostic report.
Cabin filter is the easiest fix. Replace (₹400-1,200) annually.
Antibacterial AC service treats it. Around ₹1,500-3,500.
Water pools in the housing instead of draining. Drain cleaning is part of any proper AC service.
Common with parked-outside cars. Inspection of intake (free) reveals.
Mould releases more spores when AC kicks on. After a few minutes the smell clears as the evaporator dries.
For mild cases: spray-can AC cleaners through the cabin filter slot work decently. Severe cases need professional ozone treatment.
Once a year, before the rainy / monsoon season. Bundle with cabin filter change for full effect.
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