Thermostat replacement
Thread Starter
MBWorld Fanatic!
Joined: Jun 2011
Posts: 2,119
Likes: 272
'13 GLK350 4matic,'10 C207,'15 GLA250,'07 Honda Odyssey, '18 GLE 43, '24 EQS 580
Thermostat replacement
Guys, When do you usually change the thermostat for our vehicle for preventive maintenance vs wait for it to fail and get you stranded on the side of the road moment? Doing a google search it says 10 years. I know people will say "if it ain't broke, don't fix it" but our vehicles are aging already like mine which is a 09 model. I will be flushing the coolant pretty soon and I was thinking why not do it while the coolant is out. While I am at it any other recommendations what needs to be replaced as preventive maintenance on the cooling system?
Super Member
Joined: Mar 2011
Posts: 803
Likes: 37
From: Bay Area, CA
2011 C300 Sport, P1, MM, Wood, Heated FS, DIY rearview camera.
Ten year is a magic number to me, as mine failed at round nine years and a half. I noticed the engine temperature took much longer to reach normal point. It was stuck open therefore was safe. When it failed I only got less than 60k miles.
MBWorld Fanatic!
Joined: Sep 2013
Posts: 2,376
Likes: 703
2021 GLB250 FWD, 2023 GLA250 FWD, 2013 C250, 2015 GLK350, 2005 ML350SE, 2003 E320
Same here, 9½ years, but 95,000 miles. It’s summer and 95 F so not a big deal and it’s hot in my workshop. I’ll change it when the weather gets cooler before the next winter.
Super Member
Joined: Apr 2008
Posts: 766
Likes: 173
From: Walnut Creek, CA
325Ci, 325Cic, C300
Interesting. Mine started kicking back thermostat open codes also at 9.5 years. 128k miles for me.
