Here’s a solid replacement option for your Dell Inspiron series models (3521, 3537, 3721, 5521, 5535/37, 5721, 5737, etc.):

🔧 Replacement Fan Recommendation

Generic Dell Inspiron CPU Cooling Fan

Compatible Models: Inspiron 15/17 series – 3521, 3537, 3721, 5521, 5535/37, 5721, 5737

Connector: 3‑pin (standard for many Inspiron laptops)

Price: ~₹649 on Amazon India

Rating: ~4.8★ from 15+ reviews

Affordable, widely used, and available with returns/warranty support.

Generic Dell Inspiron CPU Cooling Fan

Internal 3‑pin Dell fan

₹649

📸 Photo

Unfortunately product images aren’t accessible via text, but you’ll see the standard black 3‑pin fan unit typical of Inspiron replacements when viewing it on Amazon.

📝 Product Details & Compatibility Info

Generic replacement fans for these Inspiron models are widely stocked by vendors like SDLAPPARTS and SpareSale (₹449+)

Ensure your laptop supports the 3-pin connector; some special OEM variants use proprietary connectors (most Inspirons don’t).

Genuine Dell part numbers include 74X7K / 074X7K – available from sellers such as Xfurbish (~₹890) 🛠 Installation Tips

Verify connector and part number: Match your existing fan’s connector (3‑pin) and any label (ex: 74X7K).

Disassemble carefully: Remove back panel, unplug the old fan, unscrew, and place the new unit.

Clean before fitting: While open, use canned air to clear dust from vents and heatsink.

Reapply thermal paste: Over the CPU — improves heat transfer.

Reboot and monitor: Use BIOS or software (HWMonitor) to check fan spinning and temps.

Reddit advice:

“Oy way to be sure is to compare fan model number with one offered online.
“Just replace that fan with another laptop fan.”)

✅ Summary

Best Value: The generic Dell Inspiron fan (~₹649) balances price and reliability.

OEM Option: Dell part 74X7K (~₹890+) for those wanting brand‑exact fit.

No fan errors reported as long as you match the connector and install correctly.

Let me know if you'd like help locating step‑by‑step teardown guides, verifying your specific Inspiron SKU, or sourcing a warranty-backed version!