C36 AMG, C43 AMG (W202) 1995 - 2000

unwinterized- overheating, heat blows cold, air bubbles?

Old Mar 20, 2011 | 02:24 PM
  #1  
silence's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Dec 2007
Posts: 1,100
Likes: 0
From: Rochester, MN
sounds like airplane
unwinterized- overheating, heat blows cold, air bubbles?

How would you troubleshoot?

Seems that it running the heat with the coolant system open and letting the bubbles work their way out isn't doing it.

Is the coolant even cycling through the whole system? Can this be a thermostat issue?

I replaced the thermostat about 3 years back.
Reply
Old Mar 21, 2011 | 03:34 AM
  #2  
DRBC43AMG's Avatar
MBWorld Fanatic!
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2010
Posts: 5,890
Likes: 323
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by silence
How would you troubleshoot?

Seems that it running the heat with the coolant system open and letting the bubbles work their way out isn't doing it.

Is the coolant even cycling through the whole system? Can this be a thermostat issue?

I replaced the thermostat about 3 years back.
I don't have the solution, but can suggest you check the two way heating valve just by the bulkhead which flows the water left and right. It sometimes sticks closed. Could be also heat sensor which has not woken up yet.
Reply
Old Mar 21, 2011 | 10:46 AM
  #3  
silence's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Dec 2007
Posts: 1,100
Likes: 0
From: Rochester, MN
sounds like airplane
would that valve sound a bit like a woodchuck trying to pop and gluck it's way out of the middle of the dash as it sticks and unsticks while I drive?

Then as it unsticks a bit would it add more air bubbles, drink more of the coolant down etc. and 'cause mayhem?

I spent some time with it yesterday and got an improvement, but it's still not perfect.

Is there a trick to adding coolant to these cars without getting air bubbles? I've tried all the normal stuff- perhaps this valve is partly to blame.

I'm just glad it's not a wrecked water pump (it seems), or a blown head gasket (it seems) or a bunch of other things.
Reply
Old Mar 21, 2011 | 02:24 PM
  #4  
DRBC43AMG's Avatar
MBWorld Fanatic!
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Mar 2010
Posts: 5,890
Likes: 323
From: Land of mountains, cheese, chocolate and watches
12' W204 C63 AMG coupe "T-Rex", 12' W451 Smart Fortwo Pulse (99' W202 C43 AMG + Ultima Can-Am sold)
Originally Posted by silence
would that valve sound a bit like a woodchuck trying to pop and gluck it's way out of the middle of the dash as it sticks and unsticks while I drive?

Then as it unsticks a bit would it add more air bubbles, drink more of the coolant down etc. and 'cause mayhem?

I spent some time with it yesterday and got an improvement, but it's still not perfect.

Is there a trick to adding coolant to these cars without getting air bubbles? I've tried all the normal stuff- perhaps this valve is partly to blame.

I'm just glad it's not a wrecked water pump (it seems), or a blown head gasket (it seems) or a bunch of other things.
Hmmm, I'm not sure. Just wondering if there is a bleed tap somewhere in the system which needs to be opened to get the air to escape?
Reply
Old Mar 25, 2011 | 12:30 AM
  #5  
silence's Avatar
Thread Starter
MBWorld Fanatic!
 
Joined: Dec 2007
Posts: 1,100
Likes: 0
From: Rochester, MN
sounds like airplane
there must be!

I've managed to get it to the point of working now- but it still "burps" some air every once in a while (engine temp needle bounces and/or sounds from that location in dash)

That said- It's not overheating now and it's totally "summerized". Got to go out for a bit of a spirited drive yesterday... soooo much fun! Now just plan to do the front brakes and add a factory bike rack then drive her a bunch this year!
Reply

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

Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 06:24 PM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
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-2
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-3
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-4
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-5
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-6
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-7
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-8
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-9
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