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#4785466 - 06/13/18 05:09 AM Mercedes Benz citric acid flush
dlundblad Offline


Registered: 09/30/13
Posts: 10063
Loc: 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.


Edited by dlundblad (06/13/18 05:10 AM)
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4785469 - 06/13/18 05:18 AM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Nukeman7 Offline


Registered: 09/23/06
Posts: 237
Loc: Virginia, USA
It should be run ~10 minutes. Here is a tutorial with many pictures:

http://dieselgiant.com/mercedes_citrus_flush.htm

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#4785482 - 06/13/18 05:43 AM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: 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.
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#4785498 - 06/13/18 06:27 AM Re: Mercedes Benz citric acid flush [Re: Trav]
ET16 Offline


Registered: 10/28/08
Posts: 1271
Loc: 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!

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#4785593 - 06/13/18 08:17 AM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Delta Offline


Registered: 04/20/14
Posts: 1155
Loc: 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
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'17 VW GTI 2.0T - 6MT - 7K
'15 Camry SE - 2.5 - 19K
'99 S10 - 2.2 5MT - 153K

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#4785716 - 06/13/18 10:15 AM Re: Mercedes Benz citric acid flush [Re: dlundblad]
BrocLuno Offline


Registered: 09/06/15
Posts: 5528
Loc: 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 ...
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Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4785718 - 06/13/18 10:16 AM Re: Mercedes Benz citric acid flush [Re: Trav]
dlundblad Offline


Registered: 09/30/13
Posts: 10063
Loc: 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 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4785897 - 06/13/18 01:18 PM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Joshua_Skinner Offline


Registered: 05/08/06
Posts: 730
Loc: 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.
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2015 Nissan Frontier S King Cab, 2.5L, 5MT
Pennzoil Platinum 5W-30 in the crankcase. Red Line in the gearboxes.

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#4785913 - 06/13/18 01:36 PM Re: Mercedes Benz citric acid flush [Re: dlundblad]
bdcardinal Online   content


Registered: 06/03/05
Posts: 11016
Loc: 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?
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#4785986 - 06/13/18 03:39 PM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Joshua_Skinner Offline


Registered: 05/08/06
Posts: 730
Loc: 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.

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#4786027 - 06/13/18 04:32 PM Re: Mercedes Benz citric acid flush [Re: dlundblad]
Trav Offline


Registered: 11/20/06
Posts: 18911
Loc: 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.

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#4786380 - 06/14/18 04:54 AM Re: Mercedes Benz citric acid flush [Re: dlundblad]
dlundblad Offline


Registered: 09/30/13
Posts: 10063
Loc: 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 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4786381 - 06/14/18 04:54 AM Re: Mercedes Benz citric acid flush [Re: Trav]
dlundblad Offline


Registered: 09/30/13
Posts: 10063
Loc: 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 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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