Yosheego

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. =(

cxesar

hey pal, did you find your way to the thermostat? i wanna do a coolant flush as im coming to my 70k miles service andn i was wondering if the whole system has a drain plug.

Tbei25

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.

Frnakito71

Great info!

nyca

Did you get a check engine light? This job is $600 at the dealer.

Tbei25

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.

kc_M

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?

jpflip

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...

kc_M

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.

jpflip

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 !

chris5949

Good video instruction, just get a yellow check engine light and replaced at my local shop $450 with oil change

09775C350

sorry to revive this but I've noticed the past 2 days my temperature is only getting to 80 on the dial. I swear it was higher than that......you only had to remove the air pump? Is it worth replacing the temp. Sensor at the same time? Normal drain on the radiator just take a bunch of plastic off? I'm a big diy guy with things like this, brakes, belts, etc I do let mb change the oil and fluids though lol my 09 only has 40k a little early to be breaking

thanks for your reply

jpflip

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.

09775C350

Ok great thanks, I'm gonna do a drain and fill, eeuroparts wahler kit comes w mb antifreeze, bought a new temp sensor too since I'll be draining. Not looking forward to taking the plastics off lol

jpflip

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!

09775C350

Haha sure thing man I'll get some pictures lol

ml3204me

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

Hiloc

Thx for the video link! I'm getting a new thermostat for my 2010 W204 for Xmas...lol

Carsy

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.

Colin G

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.

Carsy

Coolant is supposed to last for 15 years.

Adi-Benz

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.

Colin G

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.

Hiloc

I found the thermostat for $61 here...
http://www.ebay.com/itm/351204880372?_trksid=p2060353.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

Atlas Grey

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).