2008 Hummer H3 Engine cooling Problems
- Complaints
- 4about this part
- Share
- 4%of 113 total for the year
- Median mileage
- 65,106miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 4 complaints about the engine cooling of the 2008 Hummer H3, 4% of the 113 complaints for this model year. Where a mileage was given, the median is 65,106 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I have a 08 Hummer H3 and just found out that I have a cracked radiator. The vehicle only has 52,891 miles on it. This seems to be happening alot to the 07 and 08 Hummer H3. I think we need a recall on this. All of the forums I have seen have had theirs crack in the same place. All on top of the radiators. This is something you might want to look into. I know personally I am tired of something going wrong on this. First was the rack and pinion with only 50,844 miles and now this. Come on its time for a recall.”
NHTSA complaint #10476991, filed 2012-09, 52,891 miles“Crack in the radiator, had it replaced at a independent shop not knowing that this is an on going problem with this modal Hummer. Definatly a flaw somewhere on gms part.”
NHTSA complaint #10481194, filed 2012-10, 103,000 miles“The contact owns a 2008 Hummer H3. When the vehicle was taken to be serviced for NHTSA campaign number: 15v421000 (visibility), the technician discovered that two bolts located on the exhaust manifold were fractured. As a result, carbon monoxide was leaking inside the vehicle. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 54,000.”
NHTSA complaint #10865560, filed 2016-05, 54,000 milesRelated service bulletins
- 10251890Mar 13, 2024This technical bulletin advises of a new fuel injection cleaner kit used for decarbonizing the intake valves to correct conditions of rough idle, Crank no start, extended crank…
- 10250775Feb 22, 2024This service bulletin provides service information to technicians on guidelines to replace Oil Cooler, Oil Cooler Lines and Oil Tank if the engine was replaced where large…
- 10249579Jan 12, 2024This PI bulletin advises the technician on the proper way to install the pistons in an engine.
- 10245395Nov 6, 2023This service bulletin provides a vibration analysis worksheet the technician can use in conjunction with the appropriate Vibration Analysis-Road testing procedure when diagnosing…
- 10244273Oct 6, 2023This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
- 10242262Aug 24, 2023This service bulletin provides graphics, information and guidelines for engine component wear to assist service personnel as a guideline to perform necessary engine repairs and…
- 10242061Aug 7, 2023This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
- 10241417Aug 1, 2023This service bulletin provides information for maintenance cleaning of the fuel injectors and gasoline detergent additive.
- 10240359Jul 31, 2023This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
- 10239101Jun 30, 2023This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.
Engine cooling: other model years
Other parts of the 2008 Hummer H3
34 complaintsVisibility (wipers, defrost, mirrors)
27 complaintsEngine
18 complaintsAir bags
17 complaintsOther or unknown
9 complaintsBody and structure
8 complaintsSteering
5 complaintsBrakes
4 complaintsEquipment
4 complaintsFuel system
4 complaintsSuspension
4 complaintsExterior lighting
3 complaints
← All problems reported for the 2008 Hummer H3
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 28, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology