Radiator Drain Plug Location?

Tiny
BNICHOLLS21
  • MEMBER
  • 2003 CHEVROLET BLAZER
Where is the radiator drain plug located?
Thursday, November 6th, 2008 AT 10:49 AM

20 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi:
The drain should be located on the bottom of the radiator on the drivers side. It looks like a wingnut and turns like one too. However, be careful. Older ones can be brittle and break while trying to open. if you are worried buy a new one before you start, they are cheap and may prevent being stuck with no fluid in radiator when you need to make a trip to buy parts. THis guide can help you service the cooling system witht he drain plug location in the diagrams below.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Check out the diagrams (Below). Please let us know what happens.
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Thursday, November 6th, 2008 AT 7:50 PM
Tiny
LINKONCOLT
  • MEMBER
  • 14 POSTS
  • 2001 CHEVROLET BLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 110,000 MILES
What is capacity of radiator & where is drain plug for it? Also I want to add fresh anti freeze & a stop leak additive. Any suggestions on an additive product that won't clog heater core etc etc?
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Sunday, November 1st, 2020 AT 2:53 PM (Merged)
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
The drain should be on the bottom right side check out the diagrams below. As far as capacity, it will be based on if you drain the block. As far as an additive, do you have a leak and know where it is? Capacity is between 1 and 2 gallons, depending if it has a tow package, a/c and other options. The drain (if it has one) will be on the bottom of one of the side tanks on the radiator. Sometimes they don't have a drain and you have to remove the hoses to drain it. I don't recommend any stop leak additives at all, if there is any restrictions they tend to compound the problem. A/C Delco has a package of "conditioning" tablets for Caddy's that is a stop leak, I would use that if any at all. If it has an intake leak you are trying to stop, it should be taken care of as soon as you can, if it leaks internally it will mix water with the oil and can cause internal engine problems. This guide will help you service the cooling system with the location of the drain plug below.

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Check out the diagrams (Below). Please let us know what happens.
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Sunday, November 1st, 2020 AT 2:53 PM (Merged)
Tiny
GENERALLEE2008
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  • 1 POST
  • 1996 CHEVROLET BLAZER
1996 Chevy Blazer

1996 chevy blazer 4.3L what kind of tool do I need and how do I drain the radiator its a slipcock?
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
Push in and twist. They tend to stick if you haven't opened it in awhile. If that don't work just remove the lower radiator hose.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
PEDRORIZLA
  • MEMBER
  • 1 POST
It’s hard to get to. But it is better to get to it through the wheel well in my opinion or use a long pair of pliers if you have them.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
I am sure that information will help others. Come back if we can help you with anything. Thanks
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
BURLY907
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET BLAZER
Engine Cooling problem
1996 Chevy Blazer Four Wheel Drive

I have looked all around the radiator on the vehicle and can not locate the drain plug for the radiator. I need to drain it so I can replace the fluid and the thermostat. Pleas help.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
If there's no drain plug-disconnect the bottom hose
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
KEVIN12881
  • MEMBER
  • 336 POSTS
If I am not mistaken, not all radiators come with drain plugs. You'll just have to take off the lower hose.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
JAMEXTRAS
  • MEMBER
  • 2 POSTS
  • 1996 CHEVROLET BLAZER
  • 200,000 MILES
I just recently bought another 96 Blazer and the previous owner left a partial jug of green coolant in the back. I must assume that he's been topping the truck off with it. The problem is, when I when to back flush the the heater core, red coolant came out. What I need to know is how do I completely drain, flush and clean every single hose, tube and passage way the coolant sees during its circuit. I, and I'm sure many others would greatly appreciate comprehensive step-by-step insructions on how to do this. So far I've only been able to find summaries of this with no mention of the drain plugs on the engine itself (or their location) and how-tos on just flushing the radiator or heater core. Complete instructions would be a serious help. Thanks
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
There are no drain plugs on the engine. Only freeze plugs. You could have some serious trouble here as green and Orange coolant do not mix. But the best thing to do is get as much coolant out as you can and get some radiatior cleaner like prestone, that has oxyalic acid in it and follow the directions on the bottle. YOU DO NOT WANT RADITOR FLUSH. Then pull the lower rad hose to get all the crap out. Before filling iwth coolant however have the system checked for a bad head gaskets /intake gaskets, quite common on these, that's is why the guy kept adding to it. Normally head gaskets on these will leak to the outside of the engine.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
JAMEXTRAS
  • MEMBER
  • 2 POSTS
Thank you for taking the time to reply but I already understand that the "best thing to do is get as much coolant out as" I can. What I asked was "how do I completely drain, flush and clean every single hose, tube and passage way the coolant sees during its circuit?" If you could detail that process step by step I'd really appreciate it.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
The only thing I can advise here is stick a hose into the radiator ro buy one fo the kits that hook up to the heater hose. Open the petcock on the radiator and start ther truck up. Copletely draining the system like you want to do is very hard and without running water through it is about the only way to do it.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
BDERBY
  • MEMBER
  • 2 POSTS
  • 1994 CHEVROLET BLAZER
  • 4WD
  • AUTOMATIC
  • 175,000 MILES
The radiator drain plug in my 1994 chevy s10 blazer keeps blowing out. We have replaced it 3 times in the last 3 months. The last time being only a week ago. All hoses have been checked and no blocks found. The thermostat is not showing any signs of over heating. What is causing this issue?
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It's pretty simple. The radiator is stripped where the plug goes and you need to replace the radiator.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
BDERBY
  • MEMBER
  • 2 POSTS
The type of plug it takes is an insert the just pops in and then the plug screws into that. We have replaced the plug and insert 3 times now but the threads on the plug keep stripping out. This is a plastic insert and plug.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
And that is different from what I said? It's stripped and needs a new radiator.
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
TODD CUNNINGHAM
  • MEMBER
  • 1 POST
I have a 1994 Chevy s10 blazer too. Changed the coolant 1 1/2 years ago. Using only my fingers I tightened the drain plug and it started to tighten and then got loose so I didn't tighten it as hard and it seemed to hold. A year later I was loosing antifreeze. Took it to my mechanic and watched him put a pressure tester on it and all the antifreeze blew out so he thought the end tank was cracked. He changed the radiator and said it was only the drain plug. I had forgotten about my previously problem until then. Well now three months later and I am loosing antifreeze again. Couldn't find a leak until I looked at the drain plug and the little tube connection was dripping. Using only my fingers turned 1/4 turn and then to make sure it was tight turned a little more (wasn't straining to tighten) and it too stripped out! Is this a common problem?
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
It has a rubber seal. It doesn't need to be over tightened like that. Expensive lesson. New radiator
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Sunday, November 1st, 2020 AT 2:54 PM (Merged)

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