2007 Hummer H3 Engine cooling Problems
- Complaints
- 13about this part
- Share
- 5%of 238 total for the year
- Median mileage
- 59,614miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 13 complaints about the engine cooling of the 2007 Hummer H3, 5% of the 238 complaints for this model year. Where a mileage was given, the median is 59,614 miles. 1 a fire, according to the filers.
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.
“Ever since I purchased this vehicle, the vehicle has stalled at between 25mph and 0. I work for the us census bureau, permanent worker and I travel through all types of weather conditions in a day, from 9,000 ft mountains covered in snow to desert gravel roads, mesas, cliffs. …”
NHTSA complaint #10448482, filed 2012-02, 35,000 miles“I was sitting in the line at my son's school, been sitting there 2 - 3 minutes, and I smelled coolant. Looked at my gauge and it was riding just below mid-point....normal. Got my son and started home. Sitting at the red light, I smelled coolant again. This time I knew it was my car. We went to a service station and ask if someone could check to see if we had a leak. They pulled my H3 into the back and hooked up a pressure tool to the radiator and low and behold, but a hairline crack on the upper driver's side of the radiator. …”
NHTSA complaint #10569454, filed 2014-03, 59,614 miles“I had dropped my daughter off at school then went to the gas station and I smelled something like it was burning and I thought it was out side. When I came out of the gas station there was smoke rolling out of my Hummer . I had jumped in and moved the vehicle away from the pumps so they would not blow up and hurt the patrons around us. The fire dept came and so did the police. They told me that the blow had started from behind the glove compartment and was on fire.”
NHTSA complaint #10272799, filed 2009-06, 17,000 miles“I was driving on the express way when I noticed my engine rev real high. I looked at the RPM's and it was almost red lined. I let off the gas imediatly and came to a slow crawl and found that it would not shift out of second gear. Pulled it off the road and shut it off to get out to find that there was transmission fluid and radiator coolant pouring from the transmission. Had it towed to a mechanic to find out that the radiator was bad which caused the transmission and coolant to mix between the two. This causing the transmission to be destroyed along with the radiator. …”
NHTSA complaint #10552523, filed 2013-11, 71,386 miles“Noticed radiator fluid dripping underneath vehicle. Opened the hood and found radiator coolant had been blown all over interior engine compartment. Enough coolant remained in the reservoir to prevent overheating. I noticed the incident just in time.”
NHTSA complaint #10668018, filed 2014-12, 53,018 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 2007 Hummer H3
76 complaintsEngine
44 complaintsVisibility (wipers, defrost, mirrors)
42 complaintsOther or unknown
26 complaintsBody and structure
22 complaintsAir bags
19 complaintsTransmission and drivetrain
19 complaintsElectronic stability control
12 complaintsFuel system
12 complaintsBrakes
11 complaintsEquipment
8 complaintsSuspension
6 complaints
← All problems reported for the 2007 Hummer H3
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 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