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. The mechanic laughed and said I was the 2nd one this week and the 6th one since they opened 6 months ago. He said that h3s were known to have radiator issues because the radiators were plastic! Seriously...plastic! I was given a quote of $1,100 to replace the radiator with another plastic one and that would give me a 2 year or 24,000 mile warranty. I brought the truck back to my house so my husband could look at it. I did some research on the internet and it seems that this is a well known problem with hummers and yet gm has not done a recall. I found a number for hummer customer service and called them. When I told the man that answered I had coolant leaking, he said "oh, give me your zip code and I will find a local dealership that can replace the radiator." no questions...he knew what the problem was already. He went on to say that we would have to "invest" in a diagnostic and if the dealership determined it was a manufacturers defect, that hummer might "participate" in the repair costs. I would think with this being such a common problem, a recall would be in order and possibly a replacement radiator that isn't plastic!
2007 Hummer H3 engine complaints
Page 3 of 3: complaints 41 to 56 of 56, newest first, as owners wrote them.
Smelled radiator fluent when I parked into the drive way, popped the hood and saw that the liquid splashed all over the engine and parts as well as on top of the plastic fan cover, which seemed odd. Couldn't find the leak in the hose. Looked at the hummer forum that I'm a member of and lord behold there was a big topic of radiators cracking and breaking in the same places with the 2007 models. No recall has been issued, so no recall has been submitted. But it's a well known defective radiator problem that gm knows about but won't recall. So they decided to make a new radiator that fixes the problem for the 2007 hummers. The problem is the middle pin that holds the radiator rubs the neck and starts a cracked under the styrofoam, thus the right drivers side cracks in the same spot as well on the plastic side. Hundreds of h3 owners had this happen to them and post pics and what not, but still no recall. This problem is ongoing and nothing is being done. I have spoke to the hummer customer service and they contacted the local gm and they scheduled my scheduled date to take my h3 in feb 17 2014, @ 8 am at the local gm dealership and hopefully they will fix this issue and not charged me to fix due to the fact that they know the problem and have done nothing to fix it. But it's been know that they will not fix the radiator and they say it's due to climate which is false because every h3 owner has it break in the same place, and have submitted countless tickets.
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. For this vehical being this low on miles this should have never happend. Gm has made a faulty radiator and something needs to be done.
Tl* the contact owns a 2007 hummer h3. The contact stated that the vehicle lost acceleration power. The contact took the vehicle to the dealer where it was determined that the valve seals in the second and fifth cylinder heads had failed. The dealer stated that the fifth cylinder head was the most dominant and caused the majority of the failure. The contact stated that both cylinder heads had a 70 percent leak. The failure was reported to the manufacturer. The VIN was not available. The failure mileage was 65,000 and the current mileage was 80,000.
Radiator is cracked on driver side due to rubbing of metal parts.
Tl* the contact owns a 2007 hummer h3. The contact stated that while driving 50 MPH, exhaust fumes filled the vehicle. The vehicle was taken to the dealer for diagnosis where it was advised to the contact that the manifold gasket needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure. The approximated failure mileage was 160,000.
Exhaust manifold bolts are breaking off the block!.
The radiator developed a stress crack and subsequently failed. Dealer advises this is a common problem for this make and model and they stock repair part accordingly. Dealer advised to report incident and enough reports may prompt special service repair or recall.
I am the original owner of a 2007 general motors hummer h3. The auto has been well maintained and professionally serviced by a gm dealership. The vehicle has 53,600 miles and is in perfect mechanical condition except this recent issue with passlock security which has rendered the vehicle unreliable and a personal and public safety hazard. The vehicle is less than 30 days out of warranty and dealer will not repair under warranty. In recent weeks, the passlock security light began randomly illuminating while driving. This light could extinguish on next start or stay illuminated through several starts. Two weeks ago while returning from a trip later at night, the vehicle was disabled and failed to start in an airport parking lot. The passlock light continually flashed and the engine cranked, but without starting. A tow truck was called, but by the time it arrived, an attempt to start the vehicle was successful and the light was extinguished. This has happened at least twice since in less inconvenient and less dangerous areas. The vehicle is unreliable and unsafe. I cannot trust it to allow my wife to drive it for fear if her being marooned in a dangerous situation. The dealer has indicated it might be several hundred dollars to repair this problem and was well aware that it was a widespread problem with gm autos. There are hundreds of similar complaints on the internet and yet there is no response or attempt to remedy this situation by the manufacturer. I am a senior citizen and need to rely on my vehicle, but cannot rely on a vehicle whose security system can disable the vehicle at any random time. As my representative, I request the federal safety agency address this with the manufacturer and remedy this safety concern. [xxx] information redacted pursuant to the freedom of information act (foia), 5 u.s.c. 552(b)(6).
Tl* the contact owns a 2007 hummer h3. The contact was traveling 40 MPH when white steam emitted from the engine. The vehicle was taken to a private mechanic. The mechanic confirmed that the radiator seal was cracked. The manufacturer was contacted. The vehicle was repaired. The failure mileage was 65,370 and the current mileage was 77,000.
Tl* the contact owns a 2007 hummer h3. The contact stated that while driving approximately 20 MPH, the engine stalled without warning and restarted. The failure occurred four times. The vehicle was taken to an authorized dealer for diagnosis and they were unable to duplicate or determine the cause of failure. The manufacturer was not notified of the failure. The approximate failure mileage was 70,000.
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. Over the past two years the vehicle has shut off while traversing mountain roads covered in snow with no guard rails, and three times, when the engine shut off, I lost steering and came within inches of going off the side (cliffs) of these roads, not to mention in town, when my engine shuts off as I drive, I have come close to hitting other vehicles or poles as I lose power steering on a turn.. I have to drive about 90 miles one way to get it serviced, while under warranty, I had it "repaired" about five times, no success, once warranty expired, gm dealers 90 miles away were still willing to inspect vehicle since problems started while under full gm warranty, but now, they refuse to give me a rental and tell me they do not know what the problem is. My local gm dealer (alamogordo) refuses to inspect vehicle and thus I am required to make a 180 mile round trip, but now, even dealer tells me they do not know what the issue is and they cannot reproduce the problem in the shop. I took about 6 videos with my droid after the problem happens, because the problem lingers for about 15 minutes, then it stops and the vehicle works fine. The videos how the RPM's going up and down, up and down, until the car shuts off, I restart it, then it shuts off again, over and over again. Problems usually appear in the am, as I drive off for the first time, before it is driven a good distance, but can and has happened at any moment. Very dangerous and I do not feel safe each morning as I leave my mountain home, especially in cold snow weather.
2007 hummer h3 has vibration in the brake and accelerator pedal. The consumer also stated the vehicle overheated while driving in traffic. *jb the consumer stated she continues to feel a kick in the pedal. The dealer was unable to fix the problems on the vehicle. Updated 01/18/11.
2007 hummer 3, breaks down continuously.
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.
On the summer of 2007, I was driving on the freeway and I had to pullover to the side because my hummer h3 started overheated. I did the proper procedure of refilling coolant to my car, but within 4 hours it leaked. I was driving for 30 min. With windows down. Not using the air conditioner. I took it to the dealership because I was still under warranty and supposedly "fixed" the problem. It is april 2008 and the other day my car shut down on me again because my car overheated. I checked all cooling placed and I refilled them with dex-cool coolant. The next morning I checked the coolant tanks and they were empty.
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