Draining and filling radiator - Chevy and GMC Duramax Diesel Forum
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Old 03-24-2010, 05:41 PM   eBay Motors  #1 (permalink)
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Draining and filling radiator

If you want to drain the entire water is there a drain valve on the radiator? It isn't in my book. Also to re-fill system surely you don't have to do it through the over flow bottle. Other choice is take upper hose off and re-fill there. Have never seen a radiator with out cap before.
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Old 03-24-2010, 05:45 PM   eBay Motors  #2 (permalink)
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:Nothingtoadd Just want to hear what people had to say.
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Old 03-24-2010, 06:06 PM   eBay Motors  #3 (permalink)
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On my LBZ I had to remove the lower rad. hose.
efill through the reservoir. It will go in believe it or not.
There is also a bleeder screw on top of the t-stat housing to remove the air.
LMM's might be the same and I'm betting they are
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Old 03-24-2010, 06:34 PM   eBay Motors  #4 (permalink)
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Pull lower hose fill through the overflow. Keep in mind you wont get all the old stuff out.
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Old 03-24-2010, 06:52 PM   eBay Motors  #5 (permalink)
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IIRC the anti freeze is good for 5 years why would you have to change it on a 08?
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Old 03-24-2010, 06:58 PM   eBay Motors  #6 (permalink)
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There is no petcock drain in LBZ and up for draining the radiator. Have to pull the hose.
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Old 03-24-2010, 09:00 PM   eBay Motors  #7 (permalink)
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We gotta a thing at work we use to refill coolant, it pulls a vaccum down on the system and uses atmospheric pressure to push the coolant in. Never have to top the system up after warm up, and no air lock anywhere in the system. It uses a small venturie and your shop air compressor to pull down a vaccum. Best thing you ever buy and use it on any vehicle, $120 or so I think. As for draining the coolant I would assume there is some kind of drain cock on the bottom corner of the rad like all other GM's I worked on are.
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Old 03-25-2010, 03:09 AM   eBay Motors  #8 (permalink)
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5 years. I wish. Getting ready for my 2nd coolant change
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Old 03-25-2010, 05:58 AM   eBay Motors  #9 (permalink)
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Youngone

Ok, You caught me. The question isn't really for my vehicle. My son's Tahoe had bad water pump and we replaced it. To check to make sure there was no leaks before putting in $30.00 worth of antifreeze. we just put in water. Now We have to make sure we drain out at least 2 gallons of water to make room for anti freeze. The Tahoe had over 100,000 miles on it and cooling system looks just like my diesel. Sorry but I'm not member on Tahoe site.
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Old 03-25-2010, 07:31 AM   eBay Motors  #10 (permalink)
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Bama1 NP just glad you got the awnser to the question.
I hope they have a drain plug not like our Deisels
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