Quick answer
Car AC Evaporator Leak: the most common causes are evaporator core corrosion from acid condensation on coil surface over years, formicary corrosion — formic acid from cabin air attacking copper evaporator tubes, physical damage from debris entering cabin air intake duct. Metre Per Second (KPHB, Hyderabad) diagnoses the exact fault and repairs it same-day — typical work runs ₹1,500 – ₹3,000, with free pickup and drop across Hyderabad, OEM-grade parts and a 1-year warranty. Call +91 8555824915.
What causes Car AC Evaporator Leak?
These are the faults we most often find behind this symptom on cars driven in Hyderabad's heat and stop-go traffic:
- Evaporator core corrosion from acid condensation on coil surface over years
- Formicary corrosion — formic acid from cabin air attacking copper evaporator tubes
- Physical damage from debris entering cabin air intake duct
- Refrigerant oil contamination in evaporator causing corrosion at contact points
- Manufacturing defect in evaporator core (more common in some European brands)
Repairs & indicative pricing (INR)
| Repair | Indicative price |
|---|---|
| Evaporator leak detection (UV dye) | ₹1,500 – ₹3,000 |
| Evaporator cleaning & corrosion treatment | ₹3,000 – ₹6,000 |
| Evaporator replacement | ₹8,000 – ₹25,000 |
| Dashboard partial disassembly for access | Included in evaporator job |
| AC full recharge after evaporator work | ₹2,000 – ₹3,500 |
Final price depends on diagnosis. We share a written estimate before any work — no surprises. Free pickup & drop across Hyderabad, OEM-grade parts and a 1-year warranty.
Frequently asked questions
My AC loses gas every 3–4 months in Hyderabad — could it be the evaporator?
If you've already replaced all O-ring seals, checked the condenser, and recharged hoses — but still lose gas every few months — the evaporator is the most likely remaining culprit. Evaporator leaks are notoriously difficult to find without UV dye because the evaporator is buried inside the dashboard. UV dye injection + UV lamp inspection (₹1,500–₹3,000) at Metre Per Second confirms evaporator leaks definitively.
Related car problems we fix in Hyderabad
Why Hyderabad drivers choose Metre Per Second
- Factory-grade diagnostics — we read the real fault, not just a generic code.
- Free pickup & drop across all of Hyderabad — KPHB, Kukatpally, Miyapur, Hitech City, Gachibowli, Banjara Hills, Secunderabad and more.
- 1-year unconditional warranty on parts and labour.
- Transparent, written estimates — typically 30–50% below authorised dealers.