HUGE Coolant Leak Hummer H2! 

I'm not aware of a manual for the H2. I use RU-vid videos almost exclusively. If I run across a good manual, I'll sure let you know!

I changed that one, too! It was definitely leaking. Thanks for your input. Thanks for watching and commenting!

Swapping out the heater core is a labor-intensive job, but you can do it. Best of luck. Thanks for watching and commenting!

Thanks for watching and commenting!

My biggest fear! Those would be a bear to fix. Thanks for watching and commenting!

Thanks for watching and commenting!

I did not mean to infer that either fluid had dried up or evaporated. I meant to indicate that there was no evidence of a prior leak in the areas indicated. Hope this helps. Thanks for watching and commenting!

I learned to call it antifreeze by growing up about a thousand miles north of my current home. Now that I live in Florida, it's definitely coolant! Thanks for watching and commenting!

@@mohawkgarage it’s definitely called antifreeze here I live in northwest Montana but I have learned that most people don’t understand that it actually cools five times better than water itself.

@@user-pq1tb8zx7e Absolutely! Even the ratio of water-to-coolant greatly affects its capabilities.

It's coming soon. The transmission is out and I'll be fixing the rear freeze plugs shortly. Thanks for watching and commenting!

That's exactly what I fear. Those would be far more difficult to repair. It makes sense that they would be in approximately the same condition. Thanks for watching and commenting!

First, thank you for the kind words. Pretty much every LS cylinder head uses the same one. Here's a copy/paste of the correct part on ebay, but you can also get it at any larger GM dealer. They are very inexpensive. Good luck! New GM cylinder head freeze plug. This is a factory stainless plug for the cylinder head. This works on all factory LS heads, 1997-2013. Each head uses 2 plugs. Plugs are sold individually. Fits the following: 97-12 LS1/LS6/LS2/LS3/LS7 Corvette 98-02 LS1 Camaro 98-02 LS1 Firebird/Trans Am 04-06 LS1/LS2 GTO 04-07 LS6/LS2 CTS-V 99-12 4.8L/5.3L/6.0L/6.2L GM Trucks Part number: 562126 Thanks for watching and commenting!

It's under 200k, but not by much. I think lack of maintenance can be worse than high miles. Coolant becomes highly acidic with the passing of time. That acidity is very hard on metals long-term. Thanks for watching and commenting!

@mohawkgarage Oh... I have an 03' with less than 90k. Maybe or maybe not the freeze plugs 🤞. Thanks for your informative video. 👍 you got my brain working(ouch). Yes, I dont don't drive much in my truck. I ride my Harley to work. Because I love riding.

@enriqueinfante7922 I love riding, too. I'm more of a car guy, though. I have some sports cars that get driven a lot more than the H2. Thanks again!

Considering I live in Florida, I may not be the best source for that answer. If I were to attempt such a thing, I'd probably thread the freeze plug opening and install a fitting of some sort. Good luck and thanks for watching and commenting!

Haha. Ya I got an estimate to have one installed and they told me they would almost have to pull top engine off to get to freeze plugs. So I chose not to cause it was expensive. Now I see the one u had difficulty with . Installing it there would be a lot easier if that area would work. Thx for the videos !

@@goofball1810 I hope you figure out a solution! Have a great night!

There are more of the same plugs on the back of each head. Sorry for the bad news, but that probably the problem. Thanks for watching and commenting!

@mohawkgarage thank you for replying, I actually got really lucky, and it was the connector at the firewall that was broken at the coolant/heater hose.

@Prahphet You sure did get lucky! I had the same problem with a Silverado a few years back. Thank you again for watching!

I know! I'm dreading the day when they go! Thanks for watching and commenting!

Absolutely. The plugs are in the same spot, but on the rear. I'll be swapping out mine very soon, as I have the transmission out and I'm looking right at them. It'll be very difficult to change the back plugs without removing the heads or transmission. I wish I had better news. I'll do a video about the job. Thanks for watching and commenting!

I've heard LOTS of horror stories about the military Humvees. I contemplated getting one for a while, but it doesn't seem to be a good daily. lol The H2 is pretty cool, but because of the fulltime AWD, the mpg is hideous. I get 9.1! Thanks for watching and commenting!

@@mohawkgarage that would suck my f350 gets about 12 and I complain at the diesel pump I used it as a daily / work truck tell about 2 year ago when I picked a IS250 up I honestly like driving it more then my truck

@@heathenprojects2639 I drive a Z06 daily. It gets 3x the mpg of the H2. lol

@@mohawkgarage lol ya I had a 01 c5 10 years ago thing got better full mileage then my neighbor pruis

@@heathenprojects2639 I love my Corvettes!

Totally! Since the video was made, all of the plugs have been replaced. I rebuilt the transmission and replaced the rear plugs while I was in there. Entire coolant system has now been flushed and has proper ratio of water to antifreeze. Thanks for watching and commenting!

You already had to rebuild the 4l80?!

I may get rid of the H2 in the future, but only after I fix a couple of things first. I like the Solstice. We contemplated getting one a while back. Cool cars! Thanks for watching and commenting!

@@mohawkgarage Well let me know fast because I trade it for a Porsche this week

@@paulswan1982 I won't be making a decision that quickly. Sorry, but I hope you get a cool car!

Good point. Everything was changed over once I confirmed no leaks. Thanks for watching and commenting!