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Flushing old coolant - Remove block coolant drain plug, or not? #5165360 07/19/19 12:20 PM
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Fitz98 Online Content OP
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Intake is off, water pump off and heater hoses disconnected.
Had problem with tranny fluid in engine coolant, that problem is resolved.
Before disassembly, I did several drains and fills, while running engine and flushed system with degreaser/cleaner designed for cooling systems.
Fluid appeared to be pretty clean at that point
Both heater cores have had hoses removed and individually flushed
My question is at this point, is there any reason to remove the block drain plugs and flush the block keeping the thoroughly flushed heater cores isolated from the system before putting it back together?
I also have a venturi coolant vacuum system, is that as good as flushing the block independently from the rest of the system?
Am I asking for problems if I get into trying to remove a block drain bolt on an engine this old?

Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5165370 07/19/19 12:28 PM
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Chris142 Online Content
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If you can get it out thats even better.


02 Wrangler Napa high milage 10w40
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Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5165379 07/19/19 12:37 PM
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atikovi Online Content
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Just went through this. Didn't remove the block plug and it cleaned up fine. I would replace the radiator hoses as mine started leaking immediately.

Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5165399 07/19/19 01:04 PM
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demarpaint Offline
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I wouldn't tempt fate removing the plug in the block.


God Bless Our Troops

Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5165402 07/19/19 01:10 PM
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BigD1 Offline
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I would remove it depending on what type of block drain. Block drain on my Volvo 240 is super easy, and only requires my fingers to tighten and loosen. If it's a thread in the block, and you can get an impact on it then I would remove it. If I had to use a wrench or six point socket to get at it, then I would just leave it. Might turn into a big mess!


1992 Toyota Pickup--AmazonBasics Conventional--10W-30--Toyota 90915YZZD1
Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5165453 07/19/19 01:48 PM
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Railrust Offline
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I think you're fine without touching them, unless of course they're easy to get to and won't break (which usually is not the case).

I remember when I owned a Lexus LS460...went to drain the block thinking...oh this will be important...yeah it was important till I realized it'd be easier to pull the engine.


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Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: Fitz98] #5166062 07/20/19 06:49 AM
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wag123 Offline
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A small amount of transmission fluid in the coolant won't hurt anything. You got most of it out so I wouldn't worry about it.

Re: Flushing old coolant - Remove block coolant drain plug, or not? [Re: demarpaint] #5166232 07/20/19 09:48 AM
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Trav Offline
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Originally Posted by demarpaint
I wouldn't tempt fate removing the plug in the block.


+1 At that age you never know if it will even budge, forcing the issue may cause issues you don't to deal with. Whenever faced with a decision like this where it is not a "must do or else" job I go by what was taught me by a much better mechanic than I am, if the risk outweighs the reward then frig it and leave well enough alone.


ASE L1, Master. Deutsch Meisterbrief.
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