MBWorld.org Forums

CLK-Class (W209) 2003 on: CLK 270 CDI, CLK 200K, CLK 200 CGI, CLK 240, CLK 320, CLK 350, CLK 500, CLK 550 [Coupes & Cabriolets]

P0128 Replace Coolant?

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Dec 10, 2019 | 02:44 PM
Share
  #1  
labguy's Avatar
labguy
Thread Starter
Senior Member
Veteran: Army
10 Year Member
Liked
Loved
 
Joined: Sep 2013
Posts: 268
Likes: 37
From: near Birmingham, AL
2014 E350 Sedan; 2025 GLB 250
P0128 Replace Coolant?
I got the CEL and had it scanned and got P0128 - thermostat. I bought the part from FCP EURO. I am trying to decide whether to replace the coolant now or top off. I have about 140k miles on the car and have not ever replace all the coolant. I did have a radiator hose leak a while ago, but only topped off the fluid.

So, should I go ahead and replace all the coolant?

Thanks.
Reply
0
Old Dec 11, 2019 | 02:41 PM
Share
  #2  
C280 Sport's Avatar
C280 Sport
MBWorld Fanatic!
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2009
Posts: 3,820
Likes: 584
From: NY & FL
MB’s of all kinds.
When was it last flushed?
Reply
0
Old Dec 11, 2019 | 02:50 PM
Share
  #3  
labguy's Avatar
labguy
Thread Starter
Senior Member
Veteran: Army
10 Year Member
Liked
Loved
 
Joined: Sep 2013
Posts: 268
Likes: 37
From: near Birmingham, AL
2014 E350 Sedan; 2025 GLB 250
Originally Posted by C280 Sport
When was it last flushed?
It has never been completely flushed.
Reply
0
Old Dec 11, 2019 | 03:47 PM
Share
  #4  
C280 Sport's Avatar
C280 Sport
MBWorld Fanatic!
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2009
Posts: 3,820
Likes: 584
From: NY & FL
MB’s of all kinds.
Originally Posted by labguy
It has never been completely flushed.
Wow... Then you are way way over due then. This should be done before the 100k mile mark...
Reply
0
Old Dec 12, 2019 | 11:27 AM
Share
  #5  
labguy's Avatar
labguy
Thread Starter
Senior Member
Veteran: Army
10 Year Member
Liked
Loved
 
Joined: Sep 2013
Posts: 268
Likes: 37
From: near Birmingham, AL
2014 E350 Sedan; 2025 GLB 250
Originally Posted by C280 Sport
Wow... Then you are way way over due then. This should be done before the 100k mile mark...
Thanks. I will have it done. BTW, according to my manual it is due at 143k miles or 15 years.
Reply
0
Old Dec 12, 2019 | 11:29 AM
Share
  #6  
bkdc's Avatar
bkdc
Senior Member
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Dec 2008
Posts: 378
Likes: 114
2015 S550, 2017 GLS450
Would you let anything go 143k miles or 15 years on your car? A jug of MB coolant costs 20 to 30 dollars and a gallon of distilled water costs 1 dollar. The radiator drain is under the car on the front passenger side.
Reply
0
Old Dec 12, 2019 | 03:25 PM
Share
  #7  
labguy's Avatar
labguy
Thread Starter
Senior Member
Veteran: Army
10 Year Member
Liked
Loved
 
Joined: Sep 2013
Posts: 268
Likes: 37
From: near Birmingham, AL
2014 E350 Sedan; 2025 GLB 250
Originally Posted by bkdc
Would you let anything go 143k miles or 15 years on your car? A jug of MB coolant costs 20 to 30 dollars and a gallon of distilled water costs 1 dollar. The radiator drain is under the car on the front passenger side.
This forum has, for the most part, recommended that we follow the maintenance schedule provided by the manufacturer.
Reply
0

Trending Topics

Old Dec 13, 2019 | 09:31 AM
Share
  #8  
C280 Sport's Avatar
C280 Sport
MBWorld Fanatic!
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Jan 2009
Posts: 3,820
Likes: 584
From: NY & FL
MB’s of all kinds.
Have to remember it is not just the miles but age as well. That is a long time IMHO. I usually do mine every 5 years or so. Milage depending. The whole sealed for life stuff does not fly with me. But thats me. I will have to look in my manual 140k miles or 15 years just seems crazy to me.
Reply
0
MB World Stories

The Best of Mercedes & AMG

story-0

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-1

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-2

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-3

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-4

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-5

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-6

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-7

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-8

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
story-9

Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

 Verdad Gallardo
Back to Subforum
CLK-Class (W209)
View Next Unread
AutoTalent | Renntech Ecu Upgrade + Aero + Exhaust For Mercedes-benz CLK 550

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 


You have already rated this thread Rating: Thread Rating: 0 votes, average.
Show Printable Version
Email this Page

Advanced Search

All times are GMT -4. The time now is 11:43 PM.

story-0
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-1
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-2
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-3
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-4
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-5
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-6
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-7
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-8
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE
story-9
Mercedes Teases Updated EQS With Steer-By-Wire and a Yoke

Slideshow: The 2027 update adds a fully digital steering system, revised styling, and potential charging upgrades as the company looks to revive interest in the luxury EV.

By Verdad Gallardo | 2026-04-04 10:24:38


VIEW MORE