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Mercedes Benz citric acid flush #4785466
06/13/18 05:09 AM
06/13/18 05:09 AM
Joined: Sep 2013
Posts: 10,534
Indiana
dlundblad Offline OP
dlundblad  Offline OP
Joined: Sep 2013
Posts: 10,534
Indiana
TLDR: Many folks seem to have good luck with the stuff so I figured I could give it a try with my Blazer before replacing the heater core. Is this stuff something that should be ran for a week or just a few minutes like other flush products? Thanks.

Additional info: My main issue is that I know the system wasn't properly flushed for the transition from Dexcool to traditional green and that it takes forever to get to temperature. (For example, 15*F is horrible.. It takes forever with the heat off and about 7 miles with the heat on.) The thermostat is a NAPA (US made) 195*F. I also want the system clean before going through the hassle of replacing the heater core. I have replaced the coolant twice since ownership and performed 1 garden hose flush. Currently using ST traditional green.

Last edited by dlundblad; 06/13/18 05:10 AM.

03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785469
06/13/18 05:18 AM
06/13/18 05:18 AM
Joined: Sep 2006
Posts: 244
Virginia, USA
Nukeman7 Offline
Nukeman7  Offline
Joined: Sep 2006
Posts: 244
Virginia, USA
It should be run ~10 minutes. Here is a tutorial with many pictures:

http://dieselgiant.com/mercedes_citrus_flush.htm

Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785482
06/13/18 05:43 AM
06/13/18 05:43 AM
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
First of all don't waste your money on the MB stuff, its a ripoff, get this, double the amount for half the price with free shipping. Same product and just as effective.

https://www.amazon.com/Citric-Acid-Powde...VAHD7CBND3PWDQA

Usually 1lb dissolved in 5 qts of warm water is about right. Remove the thermostat and replace the housing then fill the solution in. Top off with warm water and run it for 10-15 min then flush it out.
Its easy to flush with the thermostat out.


ASE L1, Master. Deutsch Meisterbrief.
Re: Mercedes Benz citric acid flush [Re: Trav] #4785498
06/13/18 06:27 AM
06/13/18 06:27 AM
Joined: Oct 2008
Posts: 1,323
MD
ET16 Offline
ET16  Offline
Joined: Oct 2008
Posts: 1,323
MD
Originally Posted By: Trav
First of all don't waste your money on the MB stuff, its a ripoff, get this, double the amount for half the price with free shipping. Same product and just as effective.

https://www.amazon.com/Citric-Acid-Powde...VAHD7CBND3PWDQA

Usually 1lb dissolved in 5 qts of warm water is about right. Remove the thermostat and replace the housing then fill the solution in. Top off with warm water and run it for 10-15 min then flush it out.
Its easy to flush with the thermostat out.


Great tip; thanks!

Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785593
06/13/18 08:17 AM
06/13/18 08:17 AM
Joined: Apr 2014
Posts: 1,279
South Central PA
Delta Online happy
Delta  Online Happy
Joined: Apr 2014
Posts: 1,279
South Central PA
dlundblad,

Just a quick note; it seems the cooling system is really good on the S-series trucks. I had the same problem during the winter and the solution was to block off the grille at anything below 20*. It would get stone cold going down the mountain with no throttle input before. Something to think about if the flush doesn't change anything


'17 VW GTI 2.0T - 6MT - 10K - Edge 0w40
'15 Camry SE - 2.5 - 20K - PP 0w20
'99 S10 - 2.2 5MT - 156K - PP 10w30
Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785716
06/13/18 10:15 AM
06/13/18 10:15 AM
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,955
Kalifornia Kollective
The other thing is to use a marine stainless steel thermostat. No competition with surrounding aluminum surfaces. A thin film of Black Super RTV around the edge of the T-Stat when you set it in place will help block any side leakage.

But yeah, in cold country, you need to block the radiator too. Plenty of surface area on the block and sump to "leak" heat away ...


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Mercedes Benz citric acid flush [Re: Trav] #4785718
06/13/18 10:16 AM
06/13/18 10:16 AM
Joined: Sep 2013
Posts: 10,534
Indiana
dlundblad Offline OP
dlundblad  Offline OP
Joined: Sep 2013
Posts: 10,534
Indiana
Originally Posted By: Trav
First of all don't waste your money on the MB stuff, its a ripoff, get this, double the amount for half the price with free shipping. Same product and just as effective.

https://www.amazon.com/Citric-Acid-Powde...VAHD7CBND3PWDQA

Usually 1lb dissolved in 5 qts of warm water is about right. Remove the thermostat and replace the housing then fill the solution in. Top off with warm water and run it for 10-15 min then flush it out.
Its easy to flush with the thermostat out.


Do you recommend dumping the existing coolant and refilling with water or is the citric flush okay with the coolant?

Not sure how big my system is, but I'll probably use 2 lbs. (10+ quarts)


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785897
06/13/18 01:18 PM
06/13/18 01:18 PM
Joined: May 2006
Posts: 759
Portland, Oregon
Joshua_Skinner Offline
Joshua_Skinner  Offline
Joined: May 2006
Posts: 759
Portland, Oregon
According to MB the citric acid flush is to be proceeded by a coolant drain and a flush with a detergent to remove any oil present.


2015 Nissan Frontier S King Cab, 2.5L, 5MT
Pennzoil Platinum 5W-30 in the crankcase. Red Line in the gearboxes.
Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785913
06/13/18 01:36 PM
06/13/18 01:36 PM
Joined: Jun 2005
Posts: 11,412
Santa Barbara, CA
bdcardinal Offline
bdcardinal  Offline
Joined: Jun 2005
Posts: 11,412
Santa Barbara, CA
So question about the linked procedure. I am assuming if you are replacing hoses, to do the R&R on them after the citric acid was drained?


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: Mercedes Benz citric acid flush [Re: dlundblad] #4785986
06/13/18 03:39 PM
06/13/18 03:39 PM
Joined: May 2006
Posts: 759
Portland, Oregon
Joshua_Skinner Offline
Joshua_Skinner  Offline
Joined: May 2006
Posts: 759
Portland, Oregon
Rubber hoses are highly acid resistant so it shouldn't matter. I'd replace them as I took the old ones off during the initial flush.


2015 Nissan Frontier S King Cab, 2.5L, 5MT
Pennzoil Platinum 5W-30 in the crankcase. Red Line in the gearboxes.
Re: Mercedes Benz citric acid flush [Re: dlundblad] #4786027
06/13/18 04:32 PM
06/13/18 04:32 PM
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Originally Posted By: dlundblad
Originally Posted By: Trav
First of all don't waste your money on the MB stuff, its a ripoff, get this, double the amount for half the price with free shipping. Same product and just as effective.

https://www.amazon.com/Citric-Acid-Powde...VAHD7CBND3PWDQA

Usually 1lb dissolved in 5 qts of warm water is about right. Remove the thermostat and replace the housing then fill the solution in. Top off with warm water and run it for 10-15 min then flush it out.
Its easy to flush with the thermostat out.


Do you recommend dumping the existing coolant and refilling with water or is the citric flush okay with the coolant?

Not sure how big my system is, but I'll probably use 2 lbs. (10+ quarts)


Flush it through with fresh water first with the thermostat out, a garden hose is okay. For a 10qt system 2lb is correct.


ASE L1, Master. Deutsch Meisterbrief.
Re: Mercedes Benz citric acid flush [Re: dlundblad] #4786380
06/14/18 04:54 AM
06/14/18 04:54 AM
Joined: Sep 2013
Posts: 10,534
Indiana
dlundblad Offline OP
dlundblad  Offline OP
Joined: Sep 2013
Posts: 10,534
Indiana
Thanks everyone.

My plan is to undo the lines and rinse the system and core with the initial garden hose flush, but the old heater core will be bypassed during the citric flush. It's coming out so there's no need to waste the chemical. The original rinse is just so it doesn't pee coolant everywhere on it's way to the recycling can... Lol


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Mercedes Benz citric acid flush [Re: Trav] #4786381
06/14/18 04:54 AM
06/14/18 04:54 AM
Joined: Sep 2013
Posts: 10,534
Indiana
dlundblad Offline OP
dlundblad  Offline OP
Joined: Sep 2013
Posts: 10,534
Indiana
Originally Posted By: Trav
First of all don't waste your money on the MB stuff, its a ripoff, get this, double the amount for half the price with free shipping. Same product and just as effective.

https://www.amazon.com/Citric-Acid-Powde...VAHD7CBND3PWDQA

Usually 1lb dissolved in 5 qts of warm water is about right. Remove the thermostat and replace the housing then fill the solution in. Top off with warm water and run it for 10-15 min then flush it out.
Its easy to flush with the thermostat out.


I plan on getting this too. She has Prime so it works out nicely. Thanks again.


03 Jeep WJ 4.0 200k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 149k Rotella T5 10w30 Supertech ST3980

Re: Mercedes Benz citric acid flush [Re: dlundblad] #4797395
06/25/18 06:14 PM
06/25/18 06:14 PM
Joined: Feb 2010
Posts: 4,838
Central Texas
sleddriver Offline
sleddriver  Offline
Joined: Feb 2010
Posts: 4,838
Central Texas
I've found citric acid at a local grocery store. Beer/wine brew shops probably also stock it as well.


1998 Volvo V70 T5 228,880 mi. Original Owner.
M1 10W-30 HM
"It's never a mistake to buy tools, defined broadly. They're not a cost, they're an investment." - J.B. Peterson
Re: Mercedes Benz citric acid flush [Re: bdcardinal] #4800296
06/29/18 06:05 AM
06/29/18 06:05 AM
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,128
MA, Mittelfranken.de
Originally Posted By: bdcardinal
So question about the linked procedure. I am assuming if you are replacing hoses, to do the R&R on them after the citric acid was drained?


That's the way I would do it, no point in running possibly grungy old water through them if you don't have to but it probably doesn't matter one way or the other.


ASE L1, Master. Deutsch Meisterbrief.
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