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Flushing Radiator... [message #225783]

Tue, 15 October 2013 19:23

mojoe

Messages: 319
Registered: November 2012
Location: Monroe, NC

Karma: 0

Senior Member

I need to flush the radiator before it gets cold. Has 10 year +- coolant.

Guess its still sort of working since the block has not cracked, but then again it has not been that cold in NC the last few years.

Anyone have an easy way to go about this?

How much coolant should it take?

Thanks in advance.!

Joe Kemenczky.. 1975 Eleganza ll " Odie " 75,000 miles.. "When I was younger, I could remember anything, whether it had happened or not." - Mark Twain. .

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Re: [GMCnet] Flushing Radiator... [message #225788 is a reply to message #225783]

Tue, 15 October 2013 19:33

Emery Stora

Messages: 959
Registered: January 2011

Karma: 4

Senior Member

It's still working for freeze protection but the anti corrosion inhibitors are long used up and the antifoam and rubber swell additives ard also long gone v

I was in the antifreeze business with Dow years ago and I change mine every two years.

Emery Stora

On Oct 15, 2013, at 6:23 PM, Joe Kemenczky <toyomojoe@live.com> wrote:

>
>
> I need to flush the radiator before it gets cold. Has 10 year +- coolant.
>
> Guess its still sort of working since the block has not cracked, but then again it has not been that cold in NC the last few years.
>
> Anyone have an easy way to go about this?
>
> How much coolant should it take?
>
> Thanks in advance.!
> --
> Joe Kemenczky
> 1975 Eleganza ll "Odie" 75,000 miles.
> Working on complete restoration. In year 2 of a 3 year restoration.
> Loving every minute!
> Monroe, NC (East of Charlotte).
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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Re: Flushing Radiator... [message #225790 is a reply to message #225783]

Tue, 15 October 2013 19:39

JohnL455

Messages: 4447
Registered: October 2006
Location: Woodstock, IL

Karma: 12

Senior Member

Modern glycol doesn't loose much freeze protection over time but the additive package is used up at 2 years leading to PH change and corrosion. I'd open the petcock, remove the cap and drain it in a litter box. Remove and clean the overflow tank. Close the petcock, fill with 50/50 ethylene glycol and distilled water or buy the pre mixed 50/50. If the radiator is 10 years neglected, might be better to remove and take to a radiator shop eventually than to try and home flush, which I don't support as being of much use. Be sure overflow is full and run with heat on till warm, shut off, let cool repeat until all air is out and reservoir at mark. This will work provided your 9# cap is good. The cap should be replaced every 5 years or so as the rubber seal and valve has a service life

John Lebetski
Woodstock, IL
77 Eleganza II

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Re: Flushing Radiator... [message #225791 is a reply to message #225790]

Tue, 15 October 2013 19:45

mojoe

Messages: 319
Registered: November 2012
Location: Monroe, NC

Karma: 0

Senior Member

Should I drain it, add water run the engine and get the coolant out of the block and drain again before adding new coolant?

Just thinking since it has sat for so long.

Joe Kemenczky.. 1975 Eleganza ll " Odie " 75,000 miles.. "When I was younger, I could remember anything, whether it had happened or not." - Mark Twain. .

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Re: [GMCnet] Flushing Radiator... [message #225800 is a reply to message #225791]

Tue, 15 October 2013 20:48

Emery Stora

Messages: 959
Registered: January 2011

Karma: 4

Senior Member

The best way that I have found to flush it is to install a Flush N Fill kit.

http://www.amazon.com/gp/aw/d/B000CCFY5W/ref=redir_mdp_mobile

You put a tee with a cap in a heater hose on the top of the engine. Remove the radiator cap and put the water deflector onto the radiator. Turn the heater valve to hot. Then connect a garden hose to the tee and it will flush the motor block and the radiator and heater core.

When it runs clean just turn off the hose and leave the cap off the tee. Open the petcock at the bottom if the radiator and deain off a couple of gallons of water. Then pour two gallons of concentrated antifreeze into the radiator. It will push water out of the tee. When you have the two gallons in replace the cap on the tee and fill the radiator with water.

I have been using this for years on all of my vehicles. It makes it very easy.

Emery Stora
77 Kingsley
Frederick, CO

On Oct 15, 2013, at 6:45 PM, Joe Kemenczky <toyomojoe@live.com> wrote:

>
>
> Should I drain it, add water run the engine and get the coolant out of the block and drain again before adding new coolant?
>
> Just thinking since it has sat for so long.
> --
> Joe Kemenczky
> 1975 Eleganza ll "Odie" 75,000 miles.
> Working on complete restoration. In year 2 of a 3 year restoration.
> Loving every minute!
> Monroe, NC (East of Charlotte).
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

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Re: [GMCnet] Flushing Radiator... [message #225815 is a reply to message #225800]

Wed, 16 October 2013 07:30

SeanKidd

Messages: 747
Registered: June 2012
Location: Northern Neck Virginia

Karma: 4

Senior Member

Be sure to drain the radiator and bring recovered coolant to proper recycling center, ethylene glycol is extremely dangerous to the environment. The flush n fill kits prevents ability to properly recover the contaminants.

Sean and Stephanie
73 Ex-CanyonLands 26' #317 "Oliver"
Hubler 1-Ton, Quad-Bags, Rear Disc, Reaction Arms, P.Huber TBs, 3.70:1 LSD Honda 6500 inverter gen.
Colonial Travelers

[Updated on: Wed, 16 October 2013 07:30]

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