2008 Hummer H3 cooling system problems: radiator cracked

Radiator Cracked


pretty bad
Typical Repair Cost:
Average Mileage:
70,200 miles
Total Complaints:
7 complaints

Most Common Solutions:

  1. replace (6 reports)
  2. not sure (1 reports)
2008 Hummer H3 cooling system problems

cooling system problem

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2008 Hummer H3 Owner Comments

problem #7

Apr 032017

H3 Alpha 5.3L

  • Automatic transmission
  • 119,000 miles


Radiator leaking around crimp at top. Damn cheap plastic radiator. Should be a recall.

Update from Apr 18, 2017: Dealership installed new radiator. Cost $800. For new upper and lower hose would have been another $300... now that's crazy.

- Jules M., Spicewood, TX, US

problem #6

Aug 212016

H3 Luxury

  • Automatic transmission
  • 73,000 miles

So only 3 months after this piece of crap car gave me issues regarding left axel seal and having to do a bolt extraction, as I was driving with my family visiting, the mother you know what, began smoking and "AC OFF" light came on. I had to pull off the freeway and call my insurance company to tow the vehicle to the mechanic....I should have listened to my hubby when he said get rid of it after the first repair - but I'm emotionally attached to this vehicle. (try not to ever get like that)

Anywho, vehicle was towed 19 miles to dealer, and radiator blew. Not sure of the cause but this was a $2300 issue. Thank GOD for the extended warranty which was only an additional $1700 to purchase, but has already paid for itself 4x over. Now, dealer tells me that radiator will need replaced.

- xatikinx, Kapolei, HI, US

problem #5

May 142016

H3 H3 Alpha 5.3L

  • Automatic transmission
  • 55,095 miles

Have owned 5 H3 Hummer models and still have three of them .Everyone of them the radiator cracks leaks .My 2008 H3 Alpha with 55,095 miles had the radiator crack and leak several days ago.Had read before H3 Alpha's had a better radiator than the 3.7 engines had .I now have doubts about any or these radiators GM put in these vehicles .None of my Hummers have been used for off roading purposes .

- shoxiefl, Pensacola, FL, US

problem #4

Dec 012012

H3 Chrome 3.7L

  • Automatic transmission
  • 52,000 miles


It's terrible once I put coolant into the reservoir it spits all over the engine.

- Shelley S., Cleveland, OH, US

problem #3

Oct 212013

H3 3.7L

  • Automatic transmission
  • 76,212 miles

Everyone I know that has a H3 or Colorado with over 50K has had this problem. The dealership says it's a common problem. The radiator repair shop has the parts in stock . So why no recall ?

- scoreh3, Agoura Hills, CA, US

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problem #2

Oct 162013

H3 3.7L

  • Automatic transmission
  • 50,749 miles

i called Hummer Canada if the radiator leak is covered under powertrain warranty, they told me its not covered. then the lady told me to my local dealership to do the diagnostic, and they are not sure if they can share or shoulder all my expenses. supposed to be there are recalls on this problems. i love my hummer but im really disappointed with the services.

- Flode E., Winnipeg, Manitoba, Canada

problem #1

Oct 102012

H3 I-5

  • Automatic transmission
  • 65,335 miles

click to see larger images

radiator cracked radiator cracked

This is a very common problem with the H3. Thousands of complaints from owners about their radiators having to be relaced, definitly a manufactured defect!!! there really needs to be a recall issued or a class action lawsuit filed.

- trippinjim, Sullivan, MO, US

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