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how to drain coolant ?

how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 7:16am

the previous owner just did the water pump, and he replace coolant with green type, and by look at the reservoid cap, i can tell it been mix with dex-cool. I want at least drain the radiator and refill it with prestone green type, since he already using green stuff. I craw under the truck, but I cant find the drain thing from the radiator, seem like everything is on in the way. any idea ?
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
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Re: how to drain coolant ?

Postby ASTE25 » Jun 13 2012, 7:27am

I would not only drain the old fluid, but I would totally flush it out and put the dexcool back in. Start by pulling the lower hose and letting most of the coolant drain. Then, put the lower hose back on and fill it with regular water. Then unhook the upper ho0se at the radiator and start the truck. Turn your heat to hot (you do not have to have th fan on). Run water from the hose into the coolant fill hole in the tank and keep running the engine untill only clear water is coming out of the top hose. Once you are sure you have flushed all the coolant, turn the truck off and again take the lower hose off to drain the water. Reconnect both the upper and lower hose and fill it with dexcool (about 1 1/2 gallons) and top it off with water. You can check your owners manual to see what the capacity is for your cooling system. You want a 50/50 mix of water and dexcool (this is how to do it with the full strength dexcool, not the premixed dexcool).
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Re: how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 7:31am

Look like sunday job. So I need 2 gallon of dex-cool ( not the 50/50 mix one right ? ), btw when you say fill with regular water, u mean garden hose water ?
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
1995 Ford Mustang GT 5.0L A4 winter beater DD Bought it just for the sound ;)
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Re: how to drain coolant ?

Postby ASTE25 » Jun 13 2012, 7:43am

That's what I use. I think it actually calls for distilled water. I have never had a problem using tap water though.
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Re: how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 7:50am

doing all this when engine is stone cold right ?
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
1995 Ford Mustang GT 5.0L A4 winter beater DD Bought it just for the sound ;)
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Re: how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 8:08am

btw, last couple day I been checking my coolant, when cold it stay at cold mark, and when hot it still stay at cold mark, btw is their anyway I can take off the reservoid and toolbrush inside it, its kinda brown, mabe because all the dex-cool stain on it.
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
1995 Ford Mustang GT 5.0L A4 winter beater DD Bought it just for the sound ;)
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Re: how to drain coolant ?

Postby ASTE25 » Jun 13 2012, 9:44am

The engine does not have to be cold, just so long as it does not have any pressure when you remove the cap, so you will not get burned. You can take the reservoir off and put some small ice cubes in it and shake it really good and that will help knock the sludge out of where you are not able to reach with a brush.
Jordan
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Re: how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 2:45pm

thanks for the tips, after read your how to, i have more confident of doing it. btw I seem cant find the drain plug on radiator, if I find out, should I leave it open with low hose dis connect ?
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
1995 Ford Mustang GT 5.0L A4 winter beater DD Bought it just for the sound ;)
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how to drain coolant ?

Postby Machster69 » Jun 13 2012, 4:16pm

I wouldnt use the drain plug at all.... Ide use the lower hose only!
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Re: how to drain coolant ?

Postby sparkplug [OP] » Jun 13 2012, 4:48pm

when pull the low hose, i disconnect from the radiator side or engine side ?
2000 Chevrolet Silverado 1500 Vortec 5.3L z71 4WD
2000 Chevrolet Camaro Z28 ls1 5.7 M6 garage queen
1999 Chevrolet Camaro Z28 Ls1 5.7 A4
1997 Chevrolet Camaro z28 Lt1 5.7 M6 DD
1995 Ford Mustang GT 5.0L A4 winter beater DD Bought it just for the sound ;)
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sparkplug
Combustion on 1 piston [L2]
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Posts: 191
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Joined: May 30 2012, 7:17pm
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Location: dallas
Year: 2000
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Extra Info: 1500 5.3L v8 z71 4WD
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