So today I notice coolant under the car....a quick check.....here we go....

 

Is it the tank or the connecting part of it?

in this case what needs to be replaced? The tank? Or just the connecting portion

 

Took it to my "Master Mechanic" already...Crazy freaking day with Mercedes Mechanics!

Said that I have a loose band clamp....so, now I get to tell stories about how when I got messing around with band clamp.....that one time.

So, shall cut it off and replace it with a screw type clamp.

All the while MB of Gainsville had called one of our clinics and let one of my staff members know they are sending a tech to replace an airbag in one of my cars (I have been ignoring the recall). I dont let them do is just because of how pushy they are. Hell, 9,000 post cards and on and on. Then they "Google" me (his words) and find one of my offices and talk to staff? Um, hard no.

 

there is a recall on rear suspension air bags? Is this to your car specific?

 

Drivers airbag on my 350

 

Have you had prior issues with coolant leaks ??


-- A: shows cap venting pressure over the top instead of thru the vent discharge -- B: shows signs of pressure relief

Q: How much coolant is this engine loosing over a time period ?

Is this qualified discharge from multiple locations?

I used to be plagued by this feature under warranty but no longer have to deal with uncontrolled heat.

This pressure relief is the result of accumulated heat causing repeated heat soaks at engine stop.


> REALITY BASED OPINIONS...
Fixing pressure relief does not need to be an up hill battle.

Leaks evidence relief, applicable to both OIL & COOLANT leaks.

--> Oil leaks "may be" related to pressure.

--> Coolant leaks "may be" related to uncontrolled accumulated heat.


I find both issues are enabled by limited oiling setup.


HK Style: MB A-250

 

@CaliBenzDriver That makes the most sense...happening in the garage parked. When I shut down my other E or our GLS I can hear water pumps a pumping. Never heard that in the E63. Might be sitting there baking....

So - there is or is not a water pump that runs on the battery when the car is shut down????

 

Duh

 

Yes, that electric pmp near the exp tank can be jumpered or better yet programmed to run for a period after engine stop or until chassis sleep. It circulates coolant through your charge air intercooler.

You can experiment running pmp to see if heat soaks overboils stop.

Beyond that the main source of accumulated heat expressed after engine stop are the 8x pistons left ineffectively spray cooled at normal driving Rpm.


During Florida cold-snap you can pay attention to engine FAN RUNNING non-stop with same heatsoak overboil regardless of cold. That will evidence inability to cool regardless of cold weather.

The opposite is effective cooling without heat soaks overboil regardless of 100°F weather.


HK Style: luxury S-320 economical power