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  #16  
Old 04-06-2017, 07:52 PM
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Originally Posted by dieselbenz1 View Post
Coolant level should be at the seam of the expansion tank a max level line exists but is hard to see. Just a side note but the 602 is known to burn coolant when the head gasket goes producing smoke and a sweet sickening smell. Nailing also can accompy this. Just thinking your coolant overflow tank could be filling your expansion tank since no room for expansion?
Just looked at the expansion tank again after reading about the coolant circuit (didn't realize there was another tank in the R fender). It's filled right up to the cap, way above the max fill arrow on the side. It also "green stuff," which I'm reading is bad. It's frustrating because the system was flushed, refilled, and pressure tested by a reputable indy Mercedes specialist - you'd think they'd know enough not to overfill the coolant, and to use the appropriate product. What am I risking like this?

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  #17  
Old 04-06-2017, 08:39 PM
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Good question being filled cold exery component of your system will subject to the thermal expansion of coolant until the pressure release point. I imagine undue stress is being placed on radiator, hoses and heater core since no allowable room for the liquid to expand. The weakest will show its self sooner than later. Maybe the same will happen if the pressure release did let liquid out now you would have a vacuum issue inside your cooling system unless the cap is fitted with a suck back valve I never looked. If you have a suck back valve it may take a long time before you realized you have a problem.

Lots of info regarding green coolant and mercedes.
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  #18  
Old 04-06-2017, 11:01 PM
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Originally Posted by Bimmer-Bob View Post
Just looked at the expansion tank again after reading about the coolant circuit (didn't realize there was another tank in the R fender). It's filled right up to the cap, way above the max fill arrow on the side. It also "green stuff," which I'm reading is bad. It's frustrating because the system was flushed, refilled, and pressure tested by a reputable indy Mercedes specialist - you'd think they'd know enough not to overfill the coolant, and to use the appropriate product. What am I risking like this?
If you change it out every year or two you're not going to do any harm to it. The green stuff is pretty safe on aluminum cooling system these days. If you want for an extra $3 dollars you can use Zerex G-O5 same stuff as MB (it's who makes MB coolant) at Advanced Auto. If you replace the stuff that's in there now, you're throwing money down the drain.
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  #19  
Old 04-07-2017, 12:04 AM
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Originally Posted by jake12tech View Post
If you change it out every year or two you're not going to do any harm to it. The green stuff is pretty safe on aluminum cooling system these days. If you want for an extra $3 dollars you can use Zerex G-O5 same stuff as MB (it's who makes MB coolant) at Advanced Auto. If you replace the stuff that's in there now, you're throwing money down the drain.
But I should at least remove the overfill, right? Thanks for the tip on the Zerex, I had read it was the same.
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  #20  
Old 04-07-2017, 12:18 AM
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I'd expect the engine to burp out anything it doesn't need. If the pressure is high enough in the system, it'll spill into the overflow bottle in the fender.

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