Recall 15V421 affects 164,993 2006-2010 Hummer H3 vehicles for overheating HVAC blower motor connector modules. Repair is free at any franchised Hummer dealer.
Hummer is recalling 164,993 2006-2010 H3 vehicles because the connector module controlling HVAC blower motor speed can overheat. An overheated module can increase the risk of a fire, and Hummer dealers will complete the recall repair free of charge.
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What's wrong?
The HVAC blower motor connector module in 2006-2010 Hummer H3 vehicles controls the fan speed for the heating, ventilation, and air conditioning system. When you choose a fan setting, electrical current passes through this connector to run the blower motor at the requested speed. That blower motor pushes air through the vents, defroster, and defogger.
On affected H3 vehicles, the male and female connector pins do not carry current the same way. The male pin has lower conductivity than required, which creates extra resistance and heat when the blower runs at medium-high or high speeds. That heat loosens the spring force in the female pin, weakens the electrical contact, and raises resistance further. The connector module then overheats and melts.
The warning sign is a blower motor that stops working, either completely or at certain fan speeds. If the connector has started melting, the fan and defroster airflow can become unreliable.
Who's affected?
Covers H3 SUVs from five model years, all tied to the same HVAC fan motor component.
| 2008 Hummer H3 | visibility component |
|---|---|
| 2007 Hummer H3 | visibility component |
| 2006 Hummer H3 | visibility component |
| 2010 Hummer H3 | visibility component |
| 2009 Hummer H3 | visibility component |
| Units affected | 164,993 |
| Field incidents | NHTSA has logged 2 field incidents to date. |
A matching year and model does not guarantee inclusion. Check your VIN to confirm whether this recall applies to your specific SUV.
What's the safety risk?
An overheating blower motor connector module raises the risk of fire. If the blower motor stops working completely or only works at certain speeds, treat that as a warning sign and schedule the recall repair soon. Repair is free at any franchised Hummer dealer.
What should I do?
- Check your VIN to confirm your 2006-2010 Hummer H3 is included in this recall.
- Contact a franchised Hummer dealer to schedule the free blower-motor connector and harness replacement that fixes the overheating HVAC fan-speed connector.
- Bring the recall notice if Hummer has mailed one. If not, reference recall number 15V421 when you call.
- Ask the dealer whether to limit HVAC blower use until the repair, since an overheated connector increases fire risk.
What happens at the repair
At the dealer, a Hummer technician replaces the affected part of the blower motor connector and harness for the heating, ventilation, and air conditioning system. This is the connector module that controls blower motor speed. Parts and labor are covered under the recall, so the dealer repair is free. The source record does not give a separate reimbursement program for owners who already paid for a related repair.
Timeline
| July 1, 2015 | NHTSA published the recall |
|---|---|
| February 26, 2016 | Owner notification mailed |
Frequently asked questions
What is recall 15V421?
Recall 15V421 covers 164,993 2006-2010 Hummer H3 SUVs with a blower motor connector module that overheats in the heating, ventilation and air conditioning system. If the connector overheats, fire risk increases. Hummer dealers will replace part of the connector and harness for free.
What should I do if my 2006-2010 Hummer H3 is on this recall?
Check your VIN to confirm your specific Hummer H3 is included in recall 15V421. If it is, contact a franchised Hummer dealer to schedule replacement of the blower motor connector and harness. Reference recall number 15V421 when you call. The repair is free.
Is the recall repair free?
Yes. Federal recall law requires the manufacturer to repair the defect at no cost, and the recall remedy says dealers will replace part of the blower motor connector and harness free of charge. Use recall number 15V421 when you contact the dealer.
What is the safety risk?
The safety risk is fire. Recall 15V421 says the connector module that controls blower motor speed for the heating, ventilation and air conditioning system overheats in affected Hummer H3 vehicles. If that connector overheats, fire risk increases.
What if I bought my Hummer H3 used?
The free recall repair still applies. Federal recall law follows the vehicle, not the first owner, so a used 2006-2010 Hummer H3 is still eligible if its VIN is included. Check your VIN, then call the dealer with recall number 15V421.
More information
| NHTSA campaign page | nhtsa.gov/vehicle-recalls/15V421000 |
|---|---|
| Hummer customer service | 1-800-732-5493 |
| NHTSA recall # | 15V421 |
| NHTSA recall # (full) | 15V421000 |
Source documents
-
Download Misc. Document (PDF) - Download Recall Document (PDF) (PDF)
- Download Recall Document (PDF) (PDF)
- Download Owner Notification Letter (PDF)
- Download Owner Notice (PDF)
- Download Recall Report (PDF)
- Download Quarterly Report (PDF)
- Download Recall Acknowledgement (PDF)
This article is generated from NHTSA's primary recall filings and reviewed against the source on May 31, 2026. RecallNotify does not paraphrase NHTSA's consequence language; that text is reproduced as written above. Editorial standards →