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Engine coolingPart report

2006 Hummer H3 Engine cooling Problems

Complaints
35about this part
Share
10%of 361 total for the year
Median mileage
52,000miles
Trend
StableComplaints filed in the last 3 full calendar years are within 25% of the 3 years before.

NHTSA recorded 35 complaints about the engine cooling of the 2006 Hummer H3, 10% of the 361 complaints for this model year. Where a mileage was given, the median is 52,000 miles.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“The oil has been changed but I will drive it 10 to 15 miles and stop. The oil light and the dinger come on. I reset the button and then come to the next stop and the light comes on and the dinger goes off. The only way it stops is shutting off vehicle and let it set overnight. I check the oil when it does this and the dip stick is fine. Is this an oil sensor problem and is this under warranty or a recall?”

NHTSA complaint #10631240, filed 2014-09, 90,000 miles

“I own a Hummer H3 the other day the aircondition stop working I look at the heater blower the links to the air conditioner the wires and resistor were frayed and extreme hot. I had to un hook it so it won't start a fire. I am not the only person with this complaint and I read other peoples story's there should be a recall, I was told to replace it could cause a fire.”

NHTSA complaint #10345124, filed 2010-07, 27,000 miles

“I have a 2006 Hummer H3 with a little over 15,000 miles on it. There is an issue of bad cylinder heads in these 3.5l i5 engines and GM has not stepped up to the plate for a recall. Another cylinder head has been ordered for my vehicle and will be fixed under warranty. What happens when my warranty runs out a year from now. I am not crazy about a dealer tearing down my engine at this point. It has not been broken in yet. I think the whole engine should be replaced. …”

NHTSA complaint #10258307, filed 2009-02, 15,100 miles

“I recently purchased a 2006 H3. From the day I bought the car I have noticed a weird idle when the vehicle is warming up. Until recently I thought it was the way the vehicle ran normally. I decided to have the vehicle inspected by a mechanic. After being inspected the mechanic noticed the vehicle's valves were not seeded right from the factory, which has caused the misfire, which causes the weird idle. I now am in the process of contacting Hummer to see if there is a solution to the problem. …”

NHTSA complaint #10264863, filed 2009-04, 61,870 miles

“Vehicle had an engine miss fire that required replacement of the head. Miss. Returned shortly after repairs. Dealer said there was no miss. Vehicle filled up with water during a rainstorm. All interior had to be removed and dried out. Electrical problems occurred that required four batteries over 12 months. Dealer stated it was my problem, because I had a small inverter for computer. Sold the vehicle to the Hummer dealer at a loss of $15,000. Hummer refused any assistance after first stating they would.”

NHTSA complaint #10168586, filed 2006-09, 10,000 miles

Related service bulletins

Engine cooling: other model years

YearComplaintsShare of year
200911%
200844%
2007135%
20063510%

Other parts of the 2006 Hummer H3

Electrical system
96 complaintsVisibility (wipers, defrost, mirrors)
59 complaintsEngine
52 complaintsBody and structure
36 complaintsOther or unknown
29 complaintsSuspension
29 complaintsAir bags
20 complaintsBrakes
20 complaintsTransmission and drivetrain
20 complaintsLatches, locks and linkages
11 complaintsSteering
11 complaintsFuel system
10 complaints

← All problems reported for the 2006 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