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#4530728 - 09/30/17 11:13 PM Another successful Citric Acid flush
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Decided to give the citric acid flush a shot in my recently acquired 2003. My usual method is to drain and fill 3 or 4 times with not very good results usually.
What I started with.


After draining the coolant, I installed a dummy thermostat I cut the center out of, and a 3/8 NPT ball valve on the block drain to make it easier for me to open and close it all the time. I can only access the left side block drain unfortunately which leaves some of the capacity in it. Book capacity is 4.8Gal and after draining both taps I can get about 2.5 gallons back into it, the rest being in the heater core and right side of the block.
Then I flushed it for about 10 minutes with both drains open at 2500rpm. I didnt have a flushing Tee, I just stuck the hose into the coolant tank which seemed to work fine.
Closed the drains, dumped about 2 lbs of citric acid powder into in and filled it up. Closed the cap. I ran it for a bit more than 5 minutes, again at 2500rpm, at which point it was up to 190F and starting to spit out the coolant cap.
I ended up letting it sit for about 20 minutes while I ate dinner before I drained it.
Stuck the hose back in and filled it, ran it about 10 minutes at 2500 with the taps open again.
Then I let it idle while I dumped 10 gallons of distilled through it. I wanted the remaining water in the system to be distilled or close to it.
Removed the ball valve, reinstalling the plug and took out my dummy thermostat for a new one. I also popped a core plug and installed a block heater.


What was most impressive to me was it actually managed to clean the coolant tank. I thought I was going to have to replace it to be able to see through it again. But its fine. There isnt I huge amount of flow in there so I thought it wouldn't do a very good job.
To fill I added 2 gallons of straight G05 and then topped up with 50/50. I also added RMI while I was at it. Ill test the concentration later this week, but it should be in the ballpark.

Bonus shot of the inside of the block after I popped the core plug out. This was post flushing.




Edited by Colt45ws (09/30/17 11:19 PM)
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4530747 - 09/30/17 11:51 PM Re: Another successful Citric Acid flush [Re: Colt45ws]
Linctex Offline


Registered: 12/31/16
Posts: 6178
Loc: Waco, TX
I would revoke your "man card" IMMEDIATELY for draining coolant into your used oil pan.

It actually [censored] to see that. You couldn't get another container?


Edited by wwillson (10/01/17 03:58 PM)
Edit Reason: bypassing censor

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#4530752 - 10/01/17 12:06 AM Re: Another successful Citric Acid flush [Re: Linctex]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Originally Posted By: Linctex
I would revoke your "man card" IMMEDIATELY for draining coolant into your used oil pan.

It actually [censored] to see that. You couldn't get another container?


lol.
Thats my dedicated coolant container. Hence the green color. My oil one is black.

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#4530758 - 10/01/17 12:19 AM Re: Another successful Citric Acid flush [Re: Linctex]
gathermewool Offline


Registered: 01/09/09
Posts: 6003
Originally Posted By: Linctex
I would revoke your "man card" IMMEDIATELY for draining coolant into your used oil pan.

It actually [censored] to see that. You couldn't get another container?


How dare you, Colt45ws. You know this kind of thing pisckses BITOGers off after they've had a few! crackmeup

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#4530764 - 10/01/17 12:37 AM Re: Another successful Citric Acid flush [Re: Linctex]
Oro_O Offline


Registered: 09/20/14
Posts: 1352
Loc: Seattle-ish, WA
Originally Posted By: Linctex
I would revoke your "man card" IMMEDIATELY for draining coolant into your used oil pan.

It actually [censored] to see that. You couldn't get another container?

Maybe I am thinking you were trying to be funny but failed?

I have a similar container that oil and fluid goes in and I clean it out in between. I recall dad using it in the early '70s on the Chevys then, still the same container doing duty now. Did I fail to follow some unknown (to me) pattern and recycle it a decade ago to buy a Chinese one now? (Goak!)



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#4530775 - 10/01/17 01:15 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
He probably got confused from the filters in it, thinking they were oil filters. However, those are coolant filters from my other car. https://bobistheoilguy.com/forums/ubbthr...ilt#Post4389034


Edited by Colt45ws (10/01/17 01:16 AM)
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4530792 - 10/01/17 01:53 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
ArcticDriver Offline


Registered: 01/27/17
Posts: 1139
Loc: USA
I have never had to use 2 pounds of an acidic cleaning product in my cooling system so I am not familiar with acceptable or recommended practices.

Plus I always use a T.

You mention, "Book capacity is 4.8Gal and after draining both taps you can get about 2.5 gallons back into it, the rest being in the heater core and right side of the block." So your vehicle leaves 2.3 gallons in the system? Almost half capacity? Are you sure a 10-gallon flush removes all that acidic solution?

Was the cooling system not working efficiently before.

BTW, I do like the color coded drain pans and green for coolant even more.
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Multiple Diesel and Gasoline vehicles

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#4530799 - 10/01/17 02:07 AM Re: Another successful Citric Acid flush [Re: ArcticDriver]
Colt45ws Offline


Registered: 08/15/06
Posts: 9648
Loc: Central Washington
Originally Posted By: ArcticDriver
I have never had to use 2 pounds of an acidic cleaning product in my cooling system so I am not familiar with acceptable or recommended practices.

Plus I always use a T.

You mention, "Book capacity is 4.8Gal and after draining both taps you can get about 2.5 gallons back into it, the rest being in the heater core and right side of the block." So your vehicle leaves 2.3 gallons in the system? Almost half capacity? Are you sure a 10-gallon flush removes all that acidic solution?

Was the cooling system not working efficiently before.

BTW, I do like the color coded drain pans and green for coolant even more.


Before I flushed with the 10 gallons of distilled I first flushed with hose water. However many gallons went through it in the 5-10 minutes it was running with the hose stuck into the coolant tank. It was working fine, a little cool due to a lazy thermo. I just wanted to remove as much of that old rusty coolant I could and any deposits it left behind.


Edited by Colt45ws (10/01/17 02:10 AM)
_________________________
-Colton
2002 Ford Crown Vic PI 207k, Ex-Kootenai County, ID Unit #42
Down for engine swap
2003 Ford Crown Vic PI 75k
Castrol EDGE HM 5W30, Fram XG2

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#4530829 - 10/01/17 03:22 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5236
Loc: Fort Lauderdale, FL
Oh yeah, you gave it what it needed. Nice!

Yes, the solution is also amazing st cleaning the tanks.
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#4530855 - 10/01/17 05:26 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
demarpaint Offline


Registered: 07/03/05
Posts: 29803
Loc: NY
Nice job. FTR my coolant container is green too. But it has seen an occasional oil change, only if two vehicles need an oil change the same day.
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#4530874 - 10/01/17 06:42 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
bullwinkle Offline


Registered: 10/09/04
Posts: 7673
Loc: Cincinnati, OH, USA
Heck, I have a green one of those for green antifreeze, and a yellow one for G-05/Premium Gold! And several of the covered black ones with the drain hole in the middle for oil.
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#4531002 - 10/01/17 09:43 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Originally Posted By: Colt45ws
Originally Posted By: Linctex
I would revoke your "man card" IMMEDIATELY for draining coolant into your used oil pan.

It actually [censored] to see that. You couldn't get another container?


lol.
Thats my dedicated coolant container. Hence the green color. My oil one is black.


Owned!

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#4531026 - 10/01/17 09:58 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
Trav Offline


Registered: 11/20/06
Posts: 18909
Loc: MA, Mittelfranken.de
Looks great but for future reference try using baking soda in the rinse water to neutralize any remaining acid, 8 tablespoons per gallon system capacity should do it, do it twice then a clean water rinse without.
You got the amount close enough for your system 1.1lb for a 2.3 gallon cooling system is recommended by MB but on an older system with aluminum radiator and heater core I would probably use 1lb and do it twice if necessary after flushing it again with clear water just to keep the percent of acid lower. If the sytem has ever used a sealer like GM tabs, bars, etc do no flush it with acid, every leak will return possibly worse than it was originally.
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#4531029 - 10/01/17 10:03 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
philipp10 Offline


Registered: 05/09/14
Posts: 1184
Loc: Minnesota
What's the issue with using an oil drain pan for coolant? Just asking as I only have one pan and never gave it a thought.

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#4531081 - 10/01/17 11:26 AM Re: Another successful Citric Acid flush [Re: Colt45ws]
double vanos Offline


Registered: 08/05/04
Posts: 1887
Loc: 5600 feet elevation, Arizona
Me neither! I clean my drain pan every time after use so I see no big deal at all...
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