Jun 10, 2015, 12:43 PM
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- Mercedes-Benz C-Class: How to Replace Thermostat
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Need to change Coolant Thermostat
Thread Starter
Senior Member
Joined: Dec 2007
Posts: 422
Likes: 1
From: Lafayette, LA
2011 E550
Need to change Coolant Thermostat
Hey guys, just wondering if anyone can help steer me to some directions on how to replace a 2008 C300 coolant thermostat. No more heat is coming out of the vents now. =(
Junior Member
Joined: Sep 2011
Posts: 66
Likes: 0
From: Margate, Florida
2009 c300 sport
Junior Member
Joined: May 2013
Posts: 30
Likes: 3
2008 c300 4matic
coolant thermostat
I got a check engine light on Monday and went to local NAPA auto parts store and had them read the engine code and brought back that the thermostat is failing. bought the thermostat online for $93 dollars and will head to a local Merces dealer to get the coolant and will be replacing it this weekend.
Newbie
Joined: Apr 2014
Posts: 4
Likes: 0
2008 mercedes c300 sport
Thermostat replacement
Hey...sorry to bring this back, but do you HAVE to take out the air filter in order to get the thermostat out? It seems all that needs to be taken out is the pulley and the belt in order to get to the bottom screw of the thermostat. And does the check engine light go off on its own after replacement?
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Member
Joined: Nov 2012
Posts: 134
Likes: 4
From: Montreal
C350 2010, BMW 325i 2001, Porsche turbo 996 2002.
I just did it on my C350 2010 and I had to remove the air pump (very easy job) but not the air filter. In my case the light went off by itself after replacement...
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Newbie
Joined: Apr 2014
Posts: 4
Likes: 0
2008 mercedes c300 sport
Awesome!! One last question, I also got the p0128 error after my check engine light came on, so I know it's the thermostat, my question is how long can I drive the car without damaging anything else? Everything runs fine, including the temperate gauge and the cars heater...NO noticeable problem except the check engine light that's on.
Member
Joined: Nov 2012
Posts: 134
Likes: 4
From: Montreal
C350 2010, BMW 325i 2001, Porsche turbo 996 2002.
The only thing I notice with my thermostat at fault was the temp was around 80 C instead of 95 C that mean the heating system was very efficient especially when it was minus 20 out there….But I drove my car for over a month with this problem before I receive the part and start the job…Keep an eye on the temp gauge !
Newbie
Joined: Dec 2014
Posts: 3
Likes: 0
09 C350
thanks for your reply
Member
Joined: Nov 2012
Posts: 134
Likes: 4
From: Montreal
C350 2010, BMW 325i 2001, Porsche turbo 996 2002.
80 is exactly the temp I had before the fault message. It should be closer to 95…. I did not bother draining the system I only loss less than a gallon of coolant. Yes the air pump should be removed, it is a very simple job but you need torx sockets set.
Member
Joined: Nov 2012
Posts: 134
Likes: 4
From: Montreal
C350 2010, BMW 325i 2001, Porsche turbo 996 2002.
Can you do me a favor! I did not found the drain LOL!!! Looked for about 10 minutes and decided to take a short cut….Let me know where it is if you found it! Thanks!
Member
Joined: Jul 2005
Posts: 114
Likes: 24
Detailed Video and short write up DIY Thermostat Replacement
Step by step Hi-Res Video show step by step how to do everything including draining the coolant as well as the P0128 error code.
http://mercedesrepairs.blogspot.com/...placement.html
http://mercedesrepairs.blogspot.com/...placement.html
Junior Member
Joined: Sep 2016
Posts: 26
Likes: 2
From: Raleigh NC, and Memphis TN
2010 C300 Sport
not sure if you guys have found anything on this but here is a youtube video that will show you how to do it on a 2008 c300.
Mercedes Thermostat Replacement (W204 C300) FCP Euro - YouTube
Mercedes Thermostat Replacement (W204 C300) FCP Euro - YouTube
MBWorld Fanatic!
Joined: Mar 2008
Posts: 3,714
Likes: 56
From: 1 hours drive north of Sydney Australia
2007 W204 220CDI Classic Sedan
There is no need to drain the coolant from the engine, just siphon it out of the header tank. . I changed the thermostat without refilling with more than a cup. If I had organised it better no coolant would have been lost.I have a diesel but it should not be ant different in a gasser.
Super Member
Joined: Aug 2016
Posts: 520
Likes: 45
From: Regina SK
2008 C-230 4Matic Sport
There is no need to drain the coolant from the engine, just siphon it out of the header tank. . I changed the thermostat without refilling with more than a cup. If I had organised it better no coolant would have been lost.I have a diesel but it should not be ant different in a gasser.
I agree with Carsy. Siphon out and reuse. Unless your coolant is old and dirty then I'd drain, flush and refill with new coolant.
Drain plug is on the bottom of the radiator to the side on the passenger side. A pain to get at if you don't have a proper jack.
MBWorld Fanatic!
Joined: Apr 2016
Posts: 4,761
Likes: 566
From: Milwaukee, WI
2010 C300 4MATIC........ 2011 C63 AMG.............. 2015 CLS400 4MATIC.....
FCPEuro video is all you need. You do NOT have to remove the extra stuff for "space" honestly space was no issue, that would just take more work.
I replaced coolant because yolo. Direct from dealer.
I replaced coolant because yolo. Direct from dealer.
Super Member
Joined: Aug 2016
Posts: 520
Likes: 45
From: Regina SK
2008 C-230 4Matic Sport
Myself also. I had to remove my oil cooler and had to drain some of the coolant anyway so all new stuff went in. MB says the coolant will last 15 years like carsy mentioned but I changed it anyway just because, even though it looked OK. I figured 8 years was long enough.
Senior Member
Joined: Jul 2016
Posts: 387
Likes: 44
From: Near Philadelphia
2005 Porsche 911, 1991 Jeep Grand Wagoneer, 2012 Mercedes C300 4Matic
Just went through this. Relatively simple job but replaced the tensioner and pulleys while you are in there as well as the belt(which should go without saying).
