H3 Coolant Flush

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H3 Coolant Flush

Postby LeeRun » Sat Nov 14, 2009 9:49 am

Hey guys basically i took a look to find how to flush my coolant and cannot find the bolt. I am aware I can just take off the output hose but that is not the correct way to do things( or so I think). Any help will be appreciated.

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Re: H3 Coolant Flush

Postby 68Whiskey » Thu Feb 17, 2011 5:55 pm

Was just wondering what did you end up doing? just pulling the hose? or taking it in for the flush? let me know Im at the same point now in my 06 H3...
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Re: H3 Coolant Flush

Postby fourfourto » Fri Feb 18, 2011 6:31 am

I drained mine by pulling the hose(Tip replace factory clamp with standard screw type)
I had to pull the hose to replace thermostat.(about 70K I got a code open thermostat)If you have some miles on the truck it might be a good idea to change the thermostat.
I used distilled water to mix with antifreeze.
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Re: H3 Coolant Flush

Postby 68Whiskey » Fri Feb 18, 2011 8:32 pm

I did the same but i was not able to drain all the fluid out. i pulled the bottom hose let it drain but was unable to find the thermostat to replace. ( and yes I had the time of my life with those $%^%$# clamps) i was able to add some dexcool but wasnt able to complete the 50/50 mix i was looking to get.

running scared but not hot.
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Re: H3 Coolant Flush

Postby fourfourto » Tue Feb 22, 2011 6:17 pm

The thermostat is on the upper part of the lower hose,to get to the one bolt you have to jack up body and the other without it jacked through the well.
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Re: H3 Coolant Flush

Postby HawaiianH3 » Wed Mar 16, 2011 8:24 pm

Im also interested in seeing where that thermostat is? Thanks for the post, got 54k on the vehicle and doing exchanging all fluids on it.

Okay so Im gonna flush my radiator tonight. i will try to take some pics and post them for you all! Wish me luck with finding that thermostat and oh yea that darn clamp! :roll:
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Re: H3 Coolant Flush

Postby tomp » Wed Mar 16, 2011 11:35 pm

Don't you have to remove the thermostat to get the majority of the old coolant out? I know on my H2 (have not yet done my H3), if I don't remove the thermostat, I only get about 1/3 of the old coolant to drain out. It takes several flsuhes to get it all out, including running the heater for a while, before I can get it all out of there.
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Re: H3 Coolant Flush

Postby f5fstop » Fri Mar 18, 2011 8:04 am

GM actually recommends removing the bottom hose, remove the coolant bottle and use a back flush system, with drinkable water to flush all the coolant out of the system. Removing the bottom hose and even the thermostat will still allow a lot of coolant to remain in the engine. I believe Prestone sells a decent back flush adapter.

I5 engine
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Thermostat and housing....
Image
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Re: H3 Coolant Flush

Postby HawaiianH3 » Wed Mar 30, 2011 9:04 pm

The diagrams are AWESOME!!!!! Ok question is; I used a radiator flush on this last change. I did not use the"back flush" method. How much of the flush will be left in the cooling system.. When I drained the radiator (bottom hose) I let it drain for 10min/only drops coming out. I read that unless you use back flush that fluid remains in the engine block??? OH no! :roll:
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Re: H3 Coolant Flush

Postby f5fstop » Sat Apr 02, 2011 9:47 am

That is true. That fluid below the level of the hose opening in the engine will not drain out. If you are using some type of chemical to flush the system, you must flush it out. That chemical is not designed to remain in the engine and mix with the anti-freeze.
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Re: H3 Coolant Flush

Postby HawaiianH3 » Mon Apr 04, 2011 8:22 pm

Ok F5, so its back to the drawing board, Im bidding on a Prestone flush kit on ebay but cant figure out where that t adapter will fit on our 3 inch hoses? Remind me not to use radiator flush next time!!! lol
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Re: H3 Coolant Flush

Postby f5fstop » Mon Apr 04, 2011 9:37 pm

Those flush kits usually connect to the inlet heater hose. But directions with the kit will tell you for sure.
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