by "BJohnson11" (brettjohnson01)
Published 05/01/2017 at 18:47
by "BJohnson11" (brettjohnson01)
Published 05/01/2017 at 18:47
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So I posted this awhile ago. Sunday I ended up replacing the thermostat and doing a full flush of the radiator and block. Refilled with the correct coolant (previously had the green stuff in it, Mercedes recommends Zerex G-05. Drove it in to work today, whole time on the way in and way back it quickly ran up to ~97C but then stuck there firm.
Just got back, threw it in park and it was still around 97C. Popped the hood, opened up the coolant overflow tank and sat inside with the heat on full blast. Sure enough, temp started to drop all the way down to maybe 85C. So I guess there was just a bunch of air trapped in the system? I figure that sitting in park with no airflow through the radiator and temp already high would be the worst case scenario for it, so if temp was able to drop back down, that’s a positive.
I’ll drive it in to work again the rest of the week and hope it continues to run cool.
"HammerheadFistpunch" (hammerheadfistpunch)
05/01/2017 at 18:53, STARS: 1
Just keep burping it occasionally, find the highest point on the cooling circuit and gently tap on it too to help it out.
"BJohnson11" (brettjohnson01)
05/01/2017 at 19:00, STARS: 0
Thats the thing thats kinda weird with the 300D. Thermostat is pretty low in the system, so the upper radiator hose is probably the high point. The bleed tube that runs from that to the coolant resevoir are probably near the same height so in theory opening the resevoir cap is potentially the best bet for burping.
"HammerheadFistpunch" (hammerheadfistpunch)
05/01/2017 at 19:03, STARS: 1
In my cruiser the heater control valve is the highest point and its above the radiator itself, if there is something on the heating circuit you might want to check for that.
"HammerheadFistpunch" (hammerheadfistpunch)
05/01/2017 at 19:09, STARS: 1
I just remembered I know a mechanic that dailied a 330cd for years. I’ll ask him about it when I see him tomorrow
"BJohnson11" (brettjohnson01)
05/01/2017 at 19:49, STARS: 0
Its a Mercedes 300d, and uh, I’m either totally wrong or you are, but I dont think they made a 330cd? Unless the 330 was a typo and its a 300cd in which case, that is correct. But thanks!
"HammerheadFistpunch" (hammerheadfistpunch)
05/01/2017 at 19:54, STARS: 0
Yeah 300cd
"LastFirstMI is my name" (donstone13)
05/01/2017 at 20:06, STARS: 0
This also works after having too many bratwursts and beers; however, it also sometimes results in a spew of foamy liquid. I think I was a 300D in a former life....
"BJohnson11" (brettjohnson01)
05/01/2017 at 20:12, STARS: 0
Haha ok, makes a lot more sense!