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2026 Electric Radiator Cooling Fan Kit for 2003-2007 Infiniti G35: Full DTC Mapping & OEM Compliance Guide
Your G35 does not overheat on the highway. It overheats at the long red light, in the drive-through line, in stop-and-go traffic.
The VQ35 V6 has no belt-driven fan at all. Two electric fans in one shroud do all the idle work; when they wear out, the needle creeps and the A/C blows warm at a standstill. The electric radiator cooling fan kit for the 2003-2007 Infiniti G35 ($191.64) replaces the whole assembly — shroud, both fans, harness side — in one job.
Why this car leans on electric fans
Infiniti traded the mechanical fan for engine space. The ECU — the car's control computer — switches the fans through relays when coolant gets hot or the A/C calls.
At 60 mph moving air does the cooling; at idle the fans are the only airflow. One motor serves the radiator, a second the A/C condenser, both share one shroud.
Two generations hide behind one name
The G35 shares its V35 platform with the 2003-2006 Nissan 350Z, and the dual fan assembly is one of the shared parts. Everything in this repair lives in the engine cooling collection.
The trap: similar-looking assemblies exist for the 2003-2008 FX35 and the second-generation sedan. A number that fits one does not fit the next.
- 2003-2006 sedan and coupe, plus the 2007 coupe → V35, VQ35DE, one assembly family.
- 2007-2008 sedan → V36, 306-hp VQ35HR, its own numbers, a fan control module.
How a failing fan announces itself
Fan failure follows a script. Catch it in act one:
- Act 1: the needle climbs only when the car stops, and settles again at speed.
- Act 2: the A/C blows warm at idle and cold on the move — the condenser is starved.
- Act 3: the needle climbs everywhere and coolant boils over — warped heads and head gaskets join the bill.
Catch it in act one and the repair stays a bolt-in part swap. Wait for act three and it does not.
The mirror image: fans that run constantly are almost never the motor. The usual suspect is a coolant temperature sensor — and your G35 runs two, one for the gauge, one for the ECU.
| Symptom | What it points to | Rule out first |
|---|---|---|
| Hot only in traffic, normal at speed | Fan path — the assembly or its control circuit | Coolant level and leaks on a cold engine |
| A/C warm at idle, cold on the move | Condenser airflow shortfall — earliest warning | Refrigerant charge and debris in the condenser fins |
| Neither fan spins on a hot idle | Motor, fuse, relay, or the V36 fan control module | The direct-power test at the fan connector |
| Fans run constantly, even after shutdown | Control side: coolant sensor first, then relay, IPDM, or module | Scan-tool reading vs real running temperature |
| Growl, wobble, or a blade that stops partway | Bearing or brush wear — replace before it seizes | Debris or a loose shroud rubbing the blade |
| Melted or discolored connector plastic | Heat-damaged harness — it will kill a new motor too | Repair it before the new assembly goes in |
One assembly, several part numbers
Part numbers look chaotic until you sort them by generation.
| Number | What it is | Where it shows up |
|---|---|---|
| 21481-CG010 | Dual fan assembly, two motors, four-terminal connector | G35, 350Z, FX35 (2003-2008); Dorman interchange 620-423 |
| 21481-CM30B | Genuine Infiniti fan assembly reference | G35 sedan built from 02/2005 onward |
| 21481-JK600 / 21481-JK60B | Second-generation car fan assembly | 2007-2008 G35 sedan (V36) |
| 21487-CD000 / 21487-CD00A | Fan motors shared with the 350Z | Single-motor replacements, same family |
| 21481-CL80A / 21483-CG000 | Same interchange family | Listed alongside 620-423 |
| 21493-EH10A → 21493-4GA0A | Fan control module, original and superseding number | 2007-2008 sedan (V36), at the shroud |
The genuine catalog splits the sedan by production date — the 02/2005 cut-off on 21481-CM30B. Listings for this range also ask you to match the plug — terminal counts changed on later cars.
The five-minute test before any money moves
One test splits the circuit in half — all you need is a fused jumper wire:
- Key off, unplug the connector at the fan assembly.
- Run battery power straight to the motor terminals.
- Watch the fan: it spins, or it does not.
A fan that spins has a healthy motor — the fault is on the control side. A fan that stays dead is the assembly, and the $191.64 kit is the right purchase.
If the motor spins, work the control side in order:
- Swap the fan relay with an identical one from the under-hood box.
- Check the coolant sensor connector for corrosion or spread pins.
- On the 2007-2008 sedan, add the IPDM behind the battery and the shroud module (21493-EH10A → 21493-4GA0A).
Owner threads repeat one story: fans that never shut off, a module swapped with no change, then the sensor convicted. The circuit is serviced separately — the cooling fan control module connector for the G35, G37, G25, Q40, and 370Z covers the plug, the engine cooling fan control module for the G35, G37, GT-R, 370Z, Juke, and Leaf the module.
Swapping the assembly
Removal is a top-side job with basic hand tools:
- Disconnect the battery negative terminal first — the harness can be live at the connector.
- Remove the intake ducting and anything blocking the shroud.
- Unplug both motor connectors and note their routing; the wires differ in length.
- Remove the shroud bolts and lift the assembly straight up — vertical clearance, not leverage.
- Rinse debris out of the fins from the back side.
Installation is the reverse, with two pauses:
- Seat both connectors square until they click; repair heat-discolored housings now.
- Test before reassembly: battery on, key on, A/C on max — both fans should run.
- Road-test in traffic: a steady needle, cold A/C at a standstill, no growl from the new bearings.
The same kit format repeats across the line — the 2009 Infiniti FX35 and EX35 fan kit, the 2014-2018 Infiniti Q50 fan kit. The failure script does not change.
Other brands fail the same way — the 1999-2006 Beetle radiator fan guide and the 2011-2012 Jetta cooling system upgrade guide walk the same diagnosis.
- Cold-engine coolant level — a low tank is a leak hunt, not a fan job; never open a hot system.
- The fins — debris on the condenser mimics fan failure.
- The direct-power test — it splits motor from control side in one motion.
- Live scan-tool coolant temperature — it convicts a lying sensor in seconds.
Frequently asked questions
Which Infiniti G35 model years does this fan kit cover?
The 2003-2006 sedans and coupes and the 2007 coupe are V35 cars with the VQ35DE and share one assembly family. The 2007-2008 sedan is the V36 car with the VQ35HR, its own numbers (21481-JK600 / 21481-JK60B) and a fan control module.
Does the G35 have one cooling fan or two?
Two, in one assembly: one motor across the radiator, one across the A/C condenser. Swap only one motor and the second, equally worn, brings the car back.
Why does my G35 only overheat in stop-and-go traffic?
At speed, moving air cools the car and the fans may never spin. A needle that climbs when you stop and settles when you move is the fan-path signature.
Why do my fans run constantly, even after the engine is shut off?
That is a control-side symptom; the usual culprit is the ECU coolant temperature sensor — a drifted sensor reads hot, the fans stay on, and no code sets. On the 2007-2008 sedan, add the shroud module (21493-EH10A, superseded by 21493-4GA0A) and the IPDM.
Are 21481-CG010 and 21481-CM30B the same part?
Same repair, two catalog sides: 21481-CG010 is the supplier cross-reference shared with the 350Z and FX35 (Dorman 620-423); 21481-CM30B is the genuine Infiniti number for sedans built from 02/2005 onward.
Can I replace just the fan motor instead of the whole assembly?
Yes — the 21487-CD000 / 21487-CD00A motors are sold separately. On a twenty-year-old assembly the kit usually wins: the second motor carries the same wear.
What should I check to be sure the kit matches my G35?
The VIN-resolved assembly number, the connector on your old unit, and the build month on early-2005 sedans. If any does not line up, send the VIN through the quote page first.
Keep the VQ cool in every traffic jam
The electric radiator cooling fan kit for the 2003-2007 Infiniti G35 is $191.64, modules and connectors in stock. Not sure which generation your car is? Send us a request for a quote, email support@koeep.com, or WhatsApp +86 181 3883 8291.
- Fan assembly references 21481-CG010 and 21481-CM30B, Dorman 620-423 the aftermarket interchange — Infiniti and supplier parts catalogs (GO-Parts, CARiD), Dorman
- Fan motors 21487-CD000 / 21487-CD00A (shared with the 2003-2006 Nissan 350Z) and the FX35 dual-fan architecture — supplier fitment catalogs
- Fan control module 21493-EH10A superseded by 21493-4GA0A — Infiniti parts supersession chain
- Chassis and engine mapping — V35 (2003-2006 plus 2007 coupe) VQ35DE, 2007-2008 sedan (V36) VQ35HR, VQ37VHR from the 2008 G37 — manufacturer specifications
- Constant-run diagnosis centered on the coolant temperature sensor, IPDM and module as secondary suspects — owner and technician forums
- Direct-power and relay swap-testing, connector verification — repair manual practice and supplier fitment notes
- Replacement cost band ≈$900 — RepairPal-style estimates; KOEEP listing — fitment and $191.64