Coolant Drain - S-10 Forum
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post #1 of 15 Old 04-07-2008, 12:36 PM Thread Starter
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Coolant Drain

2000 GMC SONOMA 2.2 eng. can anyone tell me where to drain the coolant at as I do not see a petcock anywhere only a plastic plug that does not look to be removable on the bottom of the radiator. THANKS!

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post #2 of 15 Old 04-07-2008, 12:42 PM
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Re: Coolant Drain

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2000 GMC SONOMA 2.2 eng. can anyone tell me where to drain the coolant at as I do not see a petcock anywhere only a plastic plug that does not look to be removable on the bottom of the radiator. THANKS!
Should be Left hand aft lower side of raditor. There should be a little drain hose hanging down from it also that is really easy to spot if you get under the truck.

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post #3 of 15 Old 04-07-2008, 02:06 PM
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Re: Coolant Drain

The plastic plug actually is the petcock. If you get a good look at it (I just don't remember) it either pulls out and then turns, or turns then pulls out. It's kind of a pain in the ass to do, but if you can get a good look at it you'll know which way it needs to go.



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post #4 of 15 Old 04-07-2008, 02:29 PM
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Re: Coolant Drain

it turns then pulls out.

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post #5 of 15 Old 04-07-2008, 07:21 PM
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Re: Coolant Drain

just pull off the bottom hose that the water exits from the rad
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post #6 of 15 Old 04-07-2008, 07:33 PM
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Re: Coolant Drain

Its Ezer to turn the petcock.

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post #7 of 15 Old 04-08-2008, 05:50 AM
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Re: Coolant Drain

yup, you can use the plier, becareful, I broke mine off, got new 1 from dealership cheaper than auto zone lol, turns left to loosen and it'll pop off, if broken, try loosen and rip it off, install by pushin it in then it goes in smoother

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post #8 of 15 Old 08-22-2008, 12:37 AM
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Re: Coolant Drain

Having been in there and done it yesterday, the drain plug is white nylon and has a 1/4" drive hole. A short extension on a 1/4" ratchet will open the petcock. That or a 5/16 flat blade screwdriver fits in the 1/4" diagonally and will do the job.

From the top you can see a metal pin in the nylon plug that has a bayonet like track the pin follows.

Back it out partially and it drains relatively slowly through about 1/4" nipple that some apparently have a hose attached. Drains much faster if you pull the entire nylon part out.

I found the only way I could reach the petcock was to remove the air box. That was simple enough, hose clamp on intake duct, and 10mm flange nut.

Having drained and flushed and drained all that will come out, it would only hold 6 quarts of coolant. Some places say 12, some say 14 quarts is the cooling system capacity. I might have a 50/50 mixture, and I might not. I used Peak low-tox propylene glycol, so the typical hydrometers calibrated for ethylene glycol are not calibrated properly.

So back to the original question, "Where is the drain?" Specifically where are the drain plugs on the block? 2001 2.2L.

2001 Sonoma 2.2L 5-speed long bed, stock "cheap truck"
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post #9 of 15 Old 08-22-2008, 10:12 AM
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Re: Coolant Drain

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Originally Posted by n4hhe View Post
Having been in there and done it yesterday, the drain plug is white nylon and has a 1/4" drive hole. A short extension on a 1/4" ratchet will open the petcock. That or a 5/16 flat blade screwdriver fits in the 1/4" diagonally and will do the job.

From the top you can see a metal pin in the nylon plug that has a bayonet like track the pin follows.

Back it out partially and it drains relatively slowly through about 1/4" nipple that some apparently have a hose attached. Drains much faster if you pull the entire nylon part out.

I found the only way I could reach the petcock was to remove the air box. That was simple enough, hose clamp on intake duct, and 10mm flange nut.

Having drained and flushed and drained all that will come out, it would only hold 6 quarts of coolant. Some places say 12, some say 14 quarts is the cooling system capacity. I might have a 50/50 mixture, and I might not. I used Peak low-tox propylene glycol, so the typical hydrometers calibrated for ethylene glycol are not calibrated properly.

So back to the original question, "Where is the drain?" Specifically where are the drain plugs on the block? 2001 2.2L.

Just pull your water pump off and replace it. when you pull the w/p all the rest of the coolant will come out of the block.

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post #10 of 15 Old 08-22-2008, 09:45 PM
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Re: Coolant Drain

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Just pull your water pump off and replace it. when you pull the w/p all the rest of the coolant will come out of the block.
Sorry, I'll buy a Ford or Toyota or Dodge first.

There is a lot right with the S10/Sonoma and the 2.2L engine, but the two were clearly not made for each other.
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2001 Sonoma 2.2L 5-speed long bed, stock "cheap truck"
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post #11 of 15 Old 08-23-2008, 11:06 AM
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Re: Coolant Drain

Lube the plastic pet cock with penetrating oil and it will not break, also re lube to close.
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post #12 of 15 Old 08-23-2008, 02:59 PM
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Re: Coolant Drain

My rad is cracked right where the petcok is. I didn't feel like trying my luck, I took of the hose. Also the tanks look like they're cracking too.

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post #13 of 15 Old 05-18-2019, 02:07 PM
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Re: Coolant Drain

https://www.s10forum.com/forum/f105/...k-plug-617562/

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post #14 of 15 Old 05-18-2019, 04:39 PM
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Re: Coolant Drain

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This thread has passed quietly to the next life...please do not disturb it.


BTW....so has the thread you linked...

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post #15 of 15 Old 05-23-2019, 01:13 PM
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Re: Coolant Drain


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I turned mine into an Oldsmobile, bitches love Oldsmobiles.
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